List of Scheduled Monuments in Anglesey

Anglesey includes the largest island in Wales, as well as various smaller islands. Just as Anglesey is joined by bridges to the mainland, so Holy Island is linked to Anglesey. The 143 Scheduled monuments cover over 4,000 years of the history of the islands. Spread throughout the interior and especially the coast of the islands there are 89 prehistoric scheduled sites, including chambered tombs, burial cairns and standing stones, hillforts, hut circles and a henge. Six sites date from the Roman period, and seven from early medieval times. The 18 sites from the medieval post-Norman period include spectacular castles, remote dwellings, and wells, stones and churches. Finally the modern period is mainly agrarian in its purposes, but also includes the copper, coal and brickmaking industries. After a spell as part of Gwynedd, the Isle of Anglesey County now covers the same area as the historic county of Anglesey.

Scheduled Ancient Monuments (SAMs) have statutory protection. The compilation of the list is undertaken by Cadw Welsh Historic Monuments, which is an executive agency of the National Assembly of Wales.^[1] The list of scheduled monuments below is supplied by Cadw^[2] with additional material from Royal Commission on the Ancient and Historical Monuments of Wales and Gwynedd Archaeological Trust.

Scheduled Monuments in Anglesey

The list is sorted by period, and then by Community so that sites of similar age and locality are placed near each other. Clicking on one of the heading arrows will sort the list by that information.

Image	Name	Site type	Community	Location	Details	Period	SAM No & Refs
	Barclodiad y Gawres Burial Chamber	Chambered round barrow	Aberffraw	53°12′26″N 4°30′13″W / 53.2072°N 4.5036°W / 53.2072; -4.5036 (Barclodiad-y-Gawres Burial Chamber), SH329707	Neolithic chambered tomb overlooking Trecastle Bay. Excavated in 1952-3 it is now consolidated, with lockable iron gates and a concrete domed roof. Several internal stones have Neolithic pecked geometric rock art.	Prehistoric (Neolithic)	AN032 [3]
	Din Dryfol Burial Chamber	Chambered long cairn	Aberffraw	53°13′30″N 4°24′17″W / 53.225°N 4.4048°W / 53.225; -4.4048 (Din Dryfol Burial Chamber), SH395724	The burial mound developed over several phases, culmination in a 3m high Portal Stone creating a substantial entrance. The mound has now gone, leaving the internal stone structures.	Prehistoric (Neolithic)	AN008 [4]
	Mynydd Bach round cairn	Round barrow	Aberffraw	53°12′31″N 4°30′16″W / 53.2085°N 4.5045°W / 53.2085; -4.5045 (Mynydd Bach round cairn), SH328708	A low, grass covered cairn with a stone burial cist in its centre, on a promentary alongside the more impressive Barclodiad y Gawres (AN032). A fragment of Beaker pottery was found in a 1956 excavation suggesting a Bronze Age date.	Prehistoric Bronze Age	AN149 [5]
	Trwyn Du round cairn	Round cairn	Aberffraw	53°10′57″N 4°28′02″W / 53.1824°N 4.4671°W / 53.1824; -4.4671 (Trwyn Du round cairn), SH352678	A Bronze Age cairn, excavated in 1956 and 1974, had regular sequence large and small kerbstones, some of which are still visible through the grass. The cairn was found to overlay a much older ground surface, which had a great quantity of flint workings, occupation material and two Tranchet axes dated to 7000BC in the Mesolithic.	Prehistoric (Mesolithic & Bronze Age)	AN148 [6]
	Werthyr standing stone	Standing stone	Amlwch	53°24′32″N 4°23′08″W / 53.4088°N 4.3856°W / 53.4088; -4.3856 (Werthyr standing stone), SH415928	Standing Stone 3m high between Y Werthyr and Bryn Llwyd farms. Early writings suggest there was a second upright and a long capstone, of which there is now no sign.	Prehistoric (Bronze Age)	AN150 [7]
	Presaddfed Burial Chambers	Chambered tomb	Bodedern	53°17′57″N 4°28′51″W / 53.2992°N 4.4809°W / 53.2992; -4.4809 (Presaddfed Burial Chamber), SH347808	Two megalithic stone features, one a dolmen with huge capstone, the other a collapsed stone burial chambers. A 2m gap is betweenthe two features,and it is thought a single mound would once have covered them both, though this has now disappeared without trace. In the care of Cadw, with public access.	Prehistoric (Neolithic)	AN010 [8]
	Malltraeth Yard standing stone	Standing stone	Bodorgan	53°11′49″N 4°23′02″W / 53.1969°N 4.3838°W / 53.1969; -4.3838 (Malltraeth Yard Standing Stone), SH408693	Large standing stone, 2.7 metres (8.9 ft) high, beside a railway embankement, north of Malltraeth. It has variously been named Cae Dafydd Maenhir and Trefdraeth Standing Stone. It is a pale igneous rock with many quartz veins.	Prehistoric	AN089 [9]
	Cremlyn Standing Stones	Standing stone	Cwm Cadnant	53°16′33″N 4°08′40″W / 53.2759°N 4.1444°W / 53.2759; -4.1444 (Cremlyn Standing Stones), SH571775	Two standing stones in adjacent fields. The southern one fell over in 1977 and was found to have only 30 cm below ground and 3 metres (9.8 ft) above, wedged in with packing stones. When replaced, it was concreted in.	Prehistoric	AN074 [10]
	Hendrefor Burial Chambers	Chambered tomb	Cwm Cadnant	53°16′22″N 4°10′28″W / 53.2729°N 4.1744°W / 53.2729; -4.1744 (Hendrefor Burial Chambers), SH551773	Two stone chambers, 7 metres (23 ft) apart, which would once have been buried under a single long mound. One was recorded as intact in 1802, but by 1825 only one upright remained standing, which remains 2.7 metres (8.9 ft) high. Also called Ucheldref Burial Cairn.	Prehistoric Neolithic	AN025 [11]
	Pen-y-Maen Standing Stone	Standing stone	Cwm Cadnant	53°14′34″N 4°09′09″W / 53.2427°N 4.1526°W / 53.2427; -4.1526 (Pen-y-Maen Standing Stone), SH564739	Slender standing stone, 1.65 metres (5.4 ft) high, in a field near Llandegfan. The base has worn down to reveal packing stones.	Prehistoric	AN072 [12]
	Ty-Wyn Standing Stone	Standing stone	Cwm Cadnant	53°14′34″N 4°10′08″W / 53.2428°N 4.1689°W / 53.2428; -4.1689 (Ty-Wyn Standing Stone), SH553739	Tapering slab, 3 metres (9.8 ft) high and .8 metres (2.6 ft) wide, on a rise north of Menai Bridge. Also called Plas Cadnant Standing Stone and Ty Gwyn Standing Stone. Large packing stones are visible at the base.	Prehistoric	AN073 [13]
	Pen-yr-Orsedd Standing Stones	Standing stone	Cylch-y-Garn	53°23′02″N 4°30′26″W / 53.384°N 4.5073°W / 53.384; -4.5073 (Pen-yr-Orsedd Standing Stones), SH333903	Two large slab standing stones (with reports of a now lost third), 230 metres (250 yd) apart. They are both over 2.7 metres (8.9 ft) high and 1.2 metres (3.9 ft) wide. The name may derive from 'Gorsedd' (meetings place).	Prehistoric	AN081 [14]
	Ty Mawr Standing Stone	Standing stone	Holyhead	53°17′48″N 4°37′17″W / 53.2967°N 4.6214°W / 53.2967; -4.6214 (Ty-Mawr Standing Stone), SH253809	A contorted and irregular stone block with dramatic 'swirls' in the bedding plane. It stands on a prominent site south of Holyhead.	Prehistoric	AN012 [15]
	Bryn Celli Ddu Burial Chamber	Burial Chamber	Llanddaniel Fab	53°12′28″N 4°14′10″W / 53.2077°N 4.2361°W / 53.2077; -4.2361 (Bryn-Celli-Ddu Burial Chamber), SH507701	One of the finest passage tombs in Wales, with a mysterious pillar within the burial chamber, a 'Pattern Stone' carved with sinuous serpentine designs, and before all that it was a henge with a stone circle. Excavated and re-constructed in 1928-9. Now in the care of Cadw.	Prehistoric Neolithic	AN002 [16]
	Bryn-Celli-Ddu Standing Stone	Standing stone	Llanddaniel Fab	53°12′25″N 4°14′17″W / 53.2069°N 4.238°W / 53.2069; -4.238 (Bryn-Celli-Ddu Standing Stone), SH506701	Low standing stone, wider than it is high. Only the presence of possible packing stones, and a suggested alignment with the nearby Bryn-Celli-Ddu chambered tomb indicate anything other than a natural boulder.	Prehistoric	AN085 [17]
	Bryn-yr-Hen-Bobl Burial Chamber	Chambered round cairn	Llanddaniel Fab	53°11′50″N 4°13′06″W / 53.1972°N 4.2184°W / 53.1972; -4.2184 (Bryn-yr-Hen-Bobl Burial Chamber), SH519689	'Hill of the old people' is a substantial mound with a stone chamber. Bones were found here in 1754, and along with Plas Newydd Burial Chambers (AN005) it was included in the first Ancient Monuments Act in 1882. It was excavated by W J Hemp in 1929-35, and Neolithic pottery appeared to lie under and in front of the mound, suggesting a settlement predating its use as a burial site. The chamber was given a doorway following the dig, but is not accessible to the public. It is visible from the southern edge of Plas Newydd Garden Wood.	Prehistoric Neolithic	AN006 [18]
	Plas Newydd Burial Chambers	Chambered tomb	Llanddaniel Fab	53°12′14″N 4°13′04″W / 53.2038°N 4.2179°W / 53.2038; -4.2179 (Plas Newydd Burial Chambers), SH519697	Two adjoining stone chambers of a Neolithic burial cairn form a cromlech on private lawns of Plas Newydd National Trust Country House. The monument, along with nearby Bryn-yr-Hen-Bobl, was one of only three Welsh entries in the initial Schedule of the Ancient Monuments Protection Act 1882	Prehistoric Neolithic	AN005 [19]
	Tyddyn-Bach Standing Stone	Standing stone	Llanddaniel Fab	53°12′32″N 4°14′34″W / 53.2089°N 4.2428°W / 53.2089; -4.2428 (Tyddyn-Bach Standing Stone), SH503703	The 3 metres (9.8 ft) high pointed stone is surrounded by a pile of more recent field clearance boulders. Reportedly the stone is set into a hole or socket in the bedrock. A small tree has become established, growing through the boulders.	Prehistoric	AN084 [20]
	Llanddona Standing Stone	Standing stone	Llanddona	53°17′41″N 4°09′02″W / 53.2946°N 4.1506°W / 53.2946; -4.1506 (Llanddona Standing Stone), SH567796	Small (1.7m high) jagged and much weathered upright stone, tapering to a sharp point. It is near Bwlch Farm, west of Llanddona village.	Prehistoric	AN153 [21]
	Hirdre-Faig Standing Stone	Standing stone	Llanddyfnan	53°14′49″N 4°16′23″W / 53.247°N 4.2731°W / 53.247; -4.2731 (Hirdre-Faig Standing Stone), SH484746	Large igneous slab, with distinctive quartz veins in a field east of Hirdre-Faig farm. It stands on a shallow ridge in an area known as Penmynydd.	Prehistoric	AN155 [22]
	Llanddyfnan Standing Stone	Standing stone	Llanddyfnan	53°16′59″N 4°14′57″W / 53.283°N 4.2492°W / 53.283; -4.2492 (Llanddyfnan Standing Stone), SH501785	Slender pillar, 2.4 metres (7.9 ft) tall near the road to Llanddyfnan church. It had been leaning at an angle of 45° by 1970 and was set upright again some time before 1986. A museum of all things stone-related stands just over the road.	Prehistoric	AN071 [23]
	Maen Addwyn	Standing stone	Llanddyfnan	53°19′29″N 4°18′46″W / 53.3247°N 4.3129°W / 53.3247; -4.3129 (Maen Addwyn), SH460833	Ivy-covered 3m high stone beside a road. It was formerly known as Maen Fabli, whilst another stone,that stood 500m to the north, was called Maenaddwyn, and gave its name to the crossroads at which it stood.	Prehistoric	AN069 [24]
	Tŷ Newydd Burial Chamber	Chambered tomb	Llanfaelog	53°14′09″N 4°28′57″W / 53.2359°N 4.4824°W / 53.2359; -4.4824 (Ty-Newydd Burial Chamber), SH344738	A huge capstone resting on three uprights formed a spectacular monument, described in 1865 as "one of the gems of the Anglesey Cromlechs".[25] It was excavated in 1936 and a Beaker fragment indicated the Neolithic tomb was re-used during the Bronze Age. The monument is in the care of Cadw, with public access. In recent years, the capstone cracked, since which the whole has been supported by two brick piers.	Prehistoric	AN013 [26]
	Capel Soar Standing Stone	Standing stone	Llanfaethlu	53°20′49″N 4°31′35″W / 53.347°N 4.5264°W / 53.347; -4.5264 (Capel Soar Standing Stone), SH319863	Large and prominent standing stone beside the A5025 and close to a Baptist Chapel on an exposed part of north-west Anglesey. It is a slab, 3.2 metres (10 ft) high, and 1.7 metres (5.6 ft) wide at its base, tapering to a rounded top.	Prehistoric	AN083 [27]
	Ty Mawr Burial Chamber	Chambered tomb	Llanfair Pwllgwyngyll	53°13′34″N 4°11′25″W / 53.2262°N 4.1902°W / 53.2262; -4.1902 (Burial Chamber 180m NE of Pen-y-Berth), SH538721	This Burial Chamber on the eastern edge of Llanfair PG, (described on the schedule as 180m NE of Pen-y-Berth), has a large capstone now resting on its collapsed support stones. It was a simple passage grave, suggesting an earlier date than most of the Anglesey neolithic tombs.	Prehistoric (Neolithic)	AN037 [28]
	Benllech Megalith: Goosehouse	Unclassified site	Llanfair Mathafarn Eithaf	53°19′13″N 4°13′29″W / 53.3202°N 4.2247°W / 53.3202; -4.2247 (Benllech Megalith: Goosehouse), SH519826	During sewer works in 1965 what was thought to be a small stone burial chamber was found in what is now an area of housing in Benllech. No ancient remains were found, and the presence of a medicine bottle suggested a more modern date. This left the question of what it might be. A stone goose-pen, corn drier, or a folly have all been suggested but are by no means convincing. In the absence of an explanation it retains its listed status.	Prehistoric (probably not)	AN094 [29]
	Glyn Burial Chamber, Benllech	Burial Chamber	Llanfair Mathafarn Eithaf	53°18′42″N 4°13′54″W / 53.3116°N 4.2317°W / 53.3116; -4.2317 (Glyn Burial Chamber, Benllech), SH514817	Limestone capstone, which appears to be a piece of the local bedrock, levered up and propped in place by other stones. The rise in ground around it may represent a 14m circular mound or cairn that originally covered it. Partial excavation by E.N. Baynes in 1909 found that 'treasure seekers had cleaned out the whole of the chamber'.	Prehistoric (Neolithic)	AN154 [30]
	Pant-y-Saer Burial Chamber	Chambered tomb	Llanfair Mathafarn Eithaf	53°19′03″N 4°14′23″W / 53.3175°N 4.2397°W / 53.3175; -4.2397 (Pant-y-Saer Burial Chamber), SH509824	Two large upright stones support a large capston, which now leans at a steep angle. It was 'plundered' in 1874 when a visitor dreamed of a crock of gold, but found only bones.[31] A full excavation by Lindsay Scott in 1933 found late neolithic and early Bronze Age burials of 54 individuals. The base of the chamber was cut into the bedrock, and the whole was covered by a mound with stone edging.[32]	Prehistoric	AN004 [33]
	Henblas Burial Chamber	Chambered tomb	Llangristiolus	53°13′17″N 4°21′34″W / 53.2214°N 4.3594°W / 53.2214; -4.3594 (Henblas Burial Chamber), SH425719	Three enormous boulders: two blocky and fairly upright, the other a vast slab. They are thought to be glacial erratics which have not travelled far. Striation details suggest some manoeuvering has taken place, and therefore they were probably adapted to create a huge burial tomb. Unverified 19th century reports claimed to have found an urn containing ashes and a ring of blue glass.	Prehistoric	AN003 [34]
	Bodowyr Burial Chamber	Chambered tomb	Llanidan	53°11′18″N 4°18′10″W / 53.1882°N 4.3029°W / 53.1882; -4.3029 (Bodowyr Burial Chamber), SH462681	Five surviving uprights formed the walls of a small stone chamber. Three of these now support a large mushroom shaped capstone, with one stone not reaching the capstone, and one fallen down. The whole, although never excavated, has been consolidated and fenced for protection from livestock and to facilitate public access.It is under the guardianship of Cadw, and commands spectacular vies of Snowdonia.	Prehistoric (Neolithic)	AN007 [35]
	Bryn Gwyn stones	Stone Circle	Llanidan	53°10′38″N 4°18′08″W / 53.1772°N 4.3022°W / 53.1772; -4.3022 (Bryn Gwyn stones), SH462669	Two huge standing stones on a field boundary and path east of Brynsiencyn. The taller is 4.2 metres (14 ft) high, the tallest on Anglesey. Excavations in 2010 confirmed there were once 8 stones, forming a 16m wide circle, with a further stone inside the circle, perhaps aligning with the nearby henge at Castell Bryn Gwyn (AN015).	Prehistoric (Neolithic)	AN022 [36]
	Perthi-Duon Burial Chamber	Chambered tomb	Llanidan	53°10′34″N 4°16′34″W / 53.1761°N 4.276°W / 53.1761; -4.276 (Perthi-Duon Burial Chamber), SH479667	Massive stone long-identified as a possible burial chamber capstone, in a field west of Brynsiencyn. Doubts have been expressed on whether it was used in such a way, or is simply a glacial erratic.	Prehistoric	AN059 [37]
	Trefwri Standing Stone	Standing stone	Llanidan	53°11′07″N 4°16′55″W / 53.1853°N 4.282°W / 53.1853; -4.282 (Trefwri Standing Stone), SH476677	There are two standing stones at the eastern end of the prehistoric settlement of Trefwri (see also the Pont-sarn hut circles AN087). The smaller stone, (in photo), is less convincing as an ancient stone than the larger one 200m to the east.	Prehistoric	AN086 [38]
	Llech Golman	Standing stone	Llannerch-y-medd	53°19′20″N 4°19′33″W / 53.3222°N 4.3257°W / 53.3222; -4.3257 (Llech Golman), SH451831	large blocky standing stone on an undulating ridge. It is 2.4 metres (7.9 ft) high, with packing stones exposed around the base.	Prehistoric	AN070 [39]
	Bodewryd Standing Stone	Standing stone	Mechell	53°23′05″N 4°23′52″W / 53.3847°N 4.3978°W / 53.3847; -4.3978 (Bodewryd Standing Stone), SH406902	At some 4m high this stone slab is one of the tallest standing stones on Anglesey.	Prehistoric	AN078 [40]
	Baron Hill Maen Hir	Standing stone	Mechell	53°23′47″N 4°27′11″W / 53.3963°N 4.4531°W / 53.3963; -4.4531 (Baron Hill Maen Hir), SH369916	A large standing stone 410m North of St Mechell's Church, Llanfechell. During re-seating of the stone in 2010, it was found that one of the packing stones had prehistoric patterned carvings.	Prehistoric	AN080 [41]
	Llanfechell Triangle Standing Stones	Standing stone	Mechell	53°23′48″N 4°27′43″W / 53.3966°N 4.462°W / 53.3966; -4.462 (Standing Stones), SH363916	Three Bronze Age Standing Stones, each some 2m high, at the top of a low ridge.	Prehistoric	AN030 [42]
	Lligwy Burial Chamber	Chambered tomb	Moelfre	53°21′00″N 4°15′10″W / 53.3499°N 4.2529°W / 53.3499; -4.2529 (Lligwy Burial Chamber), SH501860	Huge capstone supported by 8 side stones, all of locally occurring limestone. Described in 1781, excavated in 1909, it contained numerous Neolithic flints and pots, along with 15-30 human burials. Possible East, West and South alignment of stones suggest astronomical purposes	Prehistoric (Neolithic)	AN009 [43]
	Ogof Arian Cave	Cave	Moelfre	53°22′07″N 4°16′41″W / 53.3686°N 4.2781°W / 53.3686; -4.2781 (Ogof Arian Cave), SH485881	Cave with an inner chamber that runs some 25m into the hillside. Neolithic flint tools have been found. Know locally as Ogof Ladran (smugglers cave).	Prehistoric (Neolithic)	AN106 [44]
	Plas Bodafon Standing Stone	Standing stone	Moelfre	53°20′40″N 4°17′27″W / 53.3444°N 4.2907°W / 53.3444; -4.2907 (Plas Bodafon, standing stone to WNW of), SH476855	In woodland west of Plas Bodafaon, the stone is 1.3m high, of an unusual quartzite.	Prehistoric	AN151 [45]
	Carreg Leidr	Standing stone	Rhosybol	53°19′58″N 4°20′05″W / 53.3329°N 4.3348°W / 53.3329; -4.3348 (Carreg Leidr), SH446843	Upright stone, with an unusual bulbous top. This gave rise to a legend that a thief who had stolen books from the nearby Llandyfrydog church was turned to stone. The name means 'Thief Stone'.	Prehistoric	AN067 [46]
	Llys Einion Standing Stone	Standing stone	Rhosybol	53°20′45″N 4°21′36″W / 53.3458°N 4.3599°W / 53.3458; -4.3599 (Llys Einion Standing Stone), SH429858	small, regular stone in a field south of Rhosybol village. Two vertical grooves on the north side could have been caused by lightning strikes.	Prehistoric	AN077 [47]
	Maen Chwyf	Chambered tomb	Rhosybol	53°20′43″N 4°21′22″W / 53.3454°N 4.356°W / 53.3454; -4.356 (Maen Chwyf), SH432857	What some have identified as a large capstone propped up on supporting stones, others suggest is a natural boulder, indistinguishable from other local geology.In the absence of excavation doubts persist on both sides.	Prehistoric	AN076 [48]
	Penrhos Feilw Standing Stones	Standing stone	Trearddur	53°17′45″N 4°39′42″W / 53.2957°N 4.6618°W / 53.2957; -4.6618 (Penrhos Feilw Standing Stones), SH227809	Two tall standing stones, 3 metres (9.8 ft) high and a similar distance apart. The 1860s had recorded suggestions of a cist burial and a stone circle, but neither is in evidence. They area also known as the Plas Meilw standing stones.	Prehistoric	AN017 [49]
	Trefignath	Chambered round barrow	Trearddur	53°17′36″N 4°36′51″W / 53.2932°N 4.6142°W / 53.2932; -4.6142 (Trefignath Burial Chamber), SH258805	Neolithic tomb, expanded over three periods, each building a new chamber to the east of the previous, retaining the original alignment. It was noted in 1655, with 18th century plundering of the cairn and capstones, and reported finds of urns and bones. The most recent chamber, in use until 2250 BC, retains an elaborate entrance with tall upright portal stones. Full excavation in 1977-9 by Christopher Smith was followed by consolidation and good public access.	Prehistoric (Neolithic)	AN011 [50]
	Glan-Alaw Standing Stone	Standing stone	Tref Alaw	53°20′36″N 4°27′09″W / 53.3433°N 4.4524°W / 53.3433; -4.4524 (Glan-Alaw Standing Stone), SH368857	Large slab of stone, 2.6 metres (8.5 ft) high and almost as wide, but only .5 metres (1.6 ft) thick, standing in a field between Glan Alaw and Bod-deiniol farms, east of Llyn Alaw.	Prehistoric	AN090 [51]
	Tregwehelydd Standing Stone	Standing stone	Tref Alaw	53°19′10″N 4°29′33″W / 53.3195°N 4.4926°W / 53.3195; -4.4926 (Tregwehelydd Standing Stone), SH340831	Accessible from a footpath via Tregwehelydd Farm. It is some 8 feet (2.4 m) high, and a more or less even rectangular shap, but it has split along its bedding planes, and is now in three pieces, which were bolted back together in 1969, with large metal straps.	Prehistoric	AN018 [52]
	Castellor Hut Group	Unenclosed hut circle	Bryngwran	53°15′23″N 4°29′46″W / 53.2565°N 4.496°W / 53.2565; -4.496 (Castellor Hut Group), SH335761	There were said to be upwards of 26 round huts, with low walls, paved surfaces, and an impressive selection of Iron Age and some Roman finds. Many of thee huts were plundered for stone before a survey and excavations in 1871, and 1900, which found quern, coins, and copper ingots. Six hut outlines remain, and the field has been much ploughed. A possible (but doubtful) stone burial chamber has been described on the western side of the scheduled area.	Prehistoric Iron Age	AN088 [53]
	Enclosed Hut Group West of Mariandyrys	Enclosed hut circle	Llanddona	53°18′34″N 4°06′29″W / 53.3094°N 4.108°W / 53.3094; -4.108 (Enclosed Hut Group West of Mariandyrys), SH596812	Well preserved survival of a group of round, stone-walled hut sites, with two rectangular huts, all enclosed by a low bank. Provides a good comparison with Din Lligwy, AN023. (also called Llaniestyn Hut Group)	Prehistoric Iron Age	AN126 [54]
	Llanddona Hut Circle	Unenclosed hut circle	Llanddona	53°17′37″N 4°08′30″W / 53.2937°N 4.1417°W / 53.2937; -4.1417 (Hut Circle W of Buarth Cyttir), SH573795	Circular earthworks of a prehistoric roundhouse west of Llanddona. Although the banks are up to 5 metres (16 ft) wide now, they probably represent a collapsed stone wall some 2 metres (6.6 ft) thick and over a metre high, with perhaps a 10 metres (33 ft) diameter. A conical roof would have stood on this, rising to an impressive 8 metres (26 ft) or more in height, to make a large communal living space. It is listed as 'Hut Circle West of Buarth Cyttir'.	Prehistoric Iron Age	AN128 [55]
	Caerhoslligwy Enclosed Hut Groups	Enclosed hut circle	Llaneugrad	53°20′29″N 4°16′11″W / 53.3413°N 4.2696°W / 53.3413; -4.2696 (Caerhoslligwy Enclosed Hut Groups), SH489851	Two related sites, 200 metres apart, with evidence of Iron Age (or Roman period) hut circles. The more southerly site has a walled enclosure, and at least three buildings. Growth of trees and scrub, along with dumping of quarried material has obscured what detail there was for most of the huts.	Prehistoric (Iron Age)	AN105 [56]
	Bwlch Hut Group, Benllech	Enclosed hut circle	Llanfair Mathafarn Eithaf	53°18′39″N 4°14′05″W / 53.3107°N 4.2348°W / 53.3107; -4.2348 (Hut Group S of Bwlch, Benllech), SH512816	Variously described as a roundhouse settlement near Coed y Bwlch, Bryn Engan and Coed y Glyn, two hut circles stand on the edge of a strip of woodland southwest of Benllech. Impressive orthostats of 2 metres (6.6 ft) thick rubble-filled walls suggest huts with an internal diameter of over 9 metres (30 ft). A nearby boundary wall and rectangular building may be an enclosure wall from the same Iron Age or Romano-British period.	Prehistoric (Iron Age)	AN127 [57]
	Pant-y-Saer Hut Circles	Enclosed hut circle	Llanfair Mathafarn Eithaf	53°19′04″N 4°14′01″W / 53.3179°N 4.2336°W / 53.3179; -4.2336 (Pant-y-Saer Hut Circles), SH513824	Stone remains of two roundhouses and two ancillary rectangular buildings, within a drystone walled oval enclosure 38 metres (125 ft) across. The smaller hut has interesting stone platforms around the sides, identified as sleeping places. The site was excavated in 1931 and 1933, with numerous Iron Age and Romano-British finds, plus a 6th-century penannular brooch suggesting a continued occupation into early Medieval times.	Prehistoric (Iron Age)	AN043 [58]
	Penmon Deer Park Hut Groups & Terraces	Enclosed hut circle	Llangoed	53°18′29″N 4°03′41″W / 53.3081°N 4.0613°W / 53.3081; -4.0613 (Penmon Deer Park Hut Groups & Terraces), SH627810	Several Iron Age enclosure earthworks, each with one or more roundhouses. Part of a wider landscape of Iron Age fields.	Prehistoric (Iron Age)	AN044 [59]
	Graiglas Barrow	Round barrow	Llangristiolus	53°14′50″N 4°22′35″W / 53.2472°N 4.3765°W / 53.2472; -4.3765 (Graiglas Barrow), SH415748	Burial mound (also known as Craig Las), 9 metres (30 ft) across and 1.2 metres (3.9 ft) high, beside a minor road, on a low ridge near the Mona industrial estate. A fallen standing stone is close by to the north (not scheduled).	Prehistoric (Bronze Age)	AN112 [60]
	Tyddyn Sadler Hut Group	Enclosed hut circle	Llangristiolus	53°14′12″N 4°22′56″W / 53.2367°N 4.3822°W / 53.2367; -4.3822 (Tyddyn Sadler Hut Group), SH411737	Several square and round huts grouped amongst a network of field systems, and probably dating to Iron Age or Roman period. The wider area was noted in 1871 for its hut circles and embankments, but this particular group was first identified and documented in 1977.	Prehistoric	AN122 [61]
	Castell Bryn Gwyn	Henge & enclosure	Llanidan	53°10′42″N 4°17′52″W / 53.1784°N 4.2979°W / 53.1784; -4.2979 (Castell Bryn-Gwyn), SH465670	Revetted stone walls surround a level area some 54 metres in diameter. An earlier bank and ditch belong to a henge from the end of the Neolithic period. During the Iron Age the present wall was built, and it was refortified in Roman times and later.	Prehistoric	AN015 [62]
	Pont Sarn-Las Hut Group	Unenclosed hut circle	Llanidan	53°11′09″N 4°17′21″W / 53.1859°N 4.2891°W / 53.1859; -4.2891 (Pont Sarn-Las Hut Group), SH471678	Circles in the field, with evidence of surviving stonework. Roman coins and other finds were reported in the 18th and 19th centuries, along with the suggestion that it was part of a large pre-Roman settlement of Trefwri, perhaps extending to Caer Leb (AN014) 500m to the south.	Prehistoric	AN087 [63]
	Brynsiencyn Round Barrow	Round barrow	Llanidan	53°10′42″N 4°15′49″W / 53.1783°N 4.2637°W / 53.1783; -4.2637 (Round Barrow East of Brynsiencyn), SH488669	Large unexcavated round barrow on a gentle slope, east of Brynsiencyn. Also known as 'Round barrow west of Carn or Garn'.	Prehistoric (Bronze Age)	AN060 [64]
	Cors-y-Bol Round Barrow	Round barrow	Llannerch-y-medd	53°19′52″N 4°26′29″W / 53.331°N 4.4414°W / 53.331; -4.4414 (Cors-y-Bol Round Barrow), SH375843	Possible ring cairn, barrow, or perhaps enclosure, it was noticed by a farmer in 1956, on the edge of a bog which drains into Llyn Alaw. Also referred to as 'Cor y Bal'.	Prehistoric	AN091 [65]
	Llifad, Carreglefn	Enclosure	Mechell	53°23′30″N 4°25′49″W / 53.3916°N 4.4302°W / 53.3916; -4.4302 (Llifad, Carreglefn), SH384910	A later prehistoric pentagonal enclosure, 49 yards (45m) across. It is a possible defended settlement and stands a few hundred metres south of Pen-y-Morwydd Barrow.	Prehistoric	AN079 [66]
	Pen-y-Morwyd Round Barrow	Round barrow	Mechell	53°23′36″N 4°25′50″W / 53.3934°N 4.4306°W / 53.3934; -4.4306 (Pen-y-Morwyd Round Barrow), SH384912	Prominent burial mound on a hill-top between Llanfechell and Bodewryd. It is 25 metres (82 ft) across, and 2 metres (6.6 ft) high, crossed by a modern wall. A footpath from Rhosbeirio crosses the mound.	Prehistoric Bronze Age	AN110 [67]
	Bwlch-y-Dafarn Hut Group	Enclosed hut circle	Moelfre	53°20′47″N 4°15′55″W / 53.3463°N 4.2654°W / 53.3463; -4.2654 (Bwlch-y-Dafarn Enclosed Hut Group), SH492856	Roughly rectangular walled enclosure. Within it a well defined roundhouse, 6m across with paved floor, had Roman pottery finds. There are also two large rectangular buildings.	Prehistoric	AN104 [68]
	Glan'r Afon Hut Circle	Unenclosed hut circle	Moelfre	53°20′41″N 4°15′13″W / 53.3448°N 4.2536°W / 53.3448; -4.2536 (Hut Group N of Glan'r Afon), SH500854	Hut circle of 8m diameter with rubble-filled 1.3m thick walls, up to 0.8m high. Now in thick woodland, rectangular buildings alongside have also been recorded.	Prehistoric	AN095 [69]
	Marian-glas Hut Group	Unenclosed hut circle	Moelfre	53°20′16″N 4°15′06″W / 53.3379°N 4.2516°W / 53.3379; -4.2516 (Marian-glas Hut Group), SH501846	A roundhouse settlement, also called Cae Marh, with several huts with thick walls, some standing up to 1.4m high. Some of the hut walls are now obscured by a thicket, while others are visible as wall lines in the lawns of Marianglas caravan park. A sign by the Ministry of Public Building and Works (1962–70) indicates the location.	Prehistoric	AN093 [70]
	Parc Salmon Hut Group	Unenclosed hut circle	Moelfre	53°21′03″N 4°15′19″W / 53.3509°N 4.2552°W / 53.3509; -4.2552 (Parc Salmon Hut Group), SH500861	Circular hut and a nearby mound of discarded shellfish, with pottery and other items including half of a bronze ring. The hut had flooring of cobbles set in the earth, and a mortar stone set into the floor.	Prehistoric (Iron Age & Roman)	AN102 [71]
	Pen-y-Fynwent Barrow	Round barrow	Rhosybol	53°22′26″N 4°21′18″W / 53.374°N 4.3551°W / 53.374; -4.3551 (Pen-y-Fynwent Barrow), SH434889	A low burial mound, some 22 metres (72 ft) across and 1m high, and thought to be Bronze Age. It is in the same field as the Medieval Pen-y-Fynwent Enclosure (AN124).	Prehistoric	AN125 [72]
	Hut Circle Settlement at Capel Llochwydd	Enclosed hut circle and Chapel site	Trearddur	53°18′44″N 4°40′52″W / 53.3121°N 4.6812°W / 53.3121; -4.6812 (Enclosed Hut Circle Settlement at Capel Llochwydd), SH214828	Multi-period site, on the cliff top near South Stack on Holy Island. The walls of a ruined Medieval chapel are cut into the enclosure walls and hut circles of an Iron Age settlement. The Bronze Age burial mound of Gosgarth Bay round cairn (AN147) is a few yards up the slope. The site was, until the 1770s, the setting for local festival day gatherings, when young people would attempt 'matrimonial divining'[73]	Prehistoric & Medieval	AN133 [74]
	Gogarth Bay round cairn	Round cairn	Trearddur	53°18′42″N 4°40′56″W / 53.3116°N 4.6823°W / 53.3116; -4.6823 (Gogarth Bay round cairn), SH214827	Round cairn on the summit of a coastal ridge known as Garn, close to the Llochwydd chapel and hut site at AN133. The large low mound of stones is a Bronze Age burial cairn, with dramatic views of the coast and area.	Prehistoric (Bronze Age)	AN147 [75]
	Holyhead Mountain Hut Circles	Hut circle settlement	Trearddur	53°18′19″N 4°41′02″W / 53.3054°N 4.6838°W / 53.3054; -4.6838 (Holyhead Mountain Hut Circles), SH212820	This collection of over 20 impressive unenclosed circular stone huts (named as 'Cytiau'r Gwyddelod' on OS maps) at Ty Mawr, near South Stack, has been in the care of the state since 1911. Some 50 hut sites were noted by W O Stanley in 1862, many of which are no longer visible. The site is now within the South Stack Cliffs RSPB reserve. Evidence for occupation from the Mesolithic through to Early Medieval periods has been found, but the main standing remains are from the Iron Age.	Prehistoric Iron Age	AN016 [76]
	Plas Meilw Hut Circles	Unenclosed hut circle	Trearddur	53°17′44″N 4°39′26″W / 53.2956°N 4.6573°W / 53.2956; -4.6573 (Plas Meilw Hut Circles), SH230809		Prehistoric	AN033 [77]
	Porth Dafarch Hut Circles	Round barrow	Trearddur	53°17′18″N 4°39′02″W / 53.2882°N 4.6505°W / 53.2882; -4.6505 (Porth Dafarch Hut Circles), SH234800		Prehistoric	AN034 [78]
	Tre-Arddur Hut Group	Enclosed hut circle	Trearddur	53°17′15″N 4°36′28″W / 53.2874°N 4.6079°W / 53.2874; -4.6079 (Tre-Arddur Hut Group), SH262798		Prehistoric	AN092 [79]
	Bedd Branwen Round Cairn	Round barrow	Tref Alaw	53°20′11″N 4°27′46″W / 53.3363°N 4.4628°W / 53.3363; -4.4628 (Bedd Branwen Round Cairn), SH361849	Bronze Age cairn beside the River Alaw. An excavation of 1813 found a cremation urn, and linked the site to the burial of Branwen. The cairn has a central pillar dated to before 2000BC, and the mound raised around it soon after 1400BC. Up to 12 cremated burial urns have been identified in an excavation of 1966.	Prehistoric	AN098 [80]
	Ynys Leurad Hut Circles	Hut circle settlement	Valley	53°16′48″N 4°35′09″W / 53.2799°N 4.5858°W / 53.2799; -4.5858 (Ynys Leurad Hut Circles), SH277790		Prehistoric	AN035 [81]
	Tywyn-y-Parc Promontory Fort	Promontory Fort- coastal	Bodorgan	53°09′24″N 4°26′29″W / 53.1568°N 4.4414°W / 53.1568; -4.4414 (Tywyn-y-Parc Promontory Fort), SH368649		Prehistoric	AN049 [82]
	Y Werthyr Hillfort	Hillfort	Bryngwran	53°16′33″N 4°26′21″W / 53.2758°N 4.4391°W / 53.2758; -4.4391 (Y Werthyr Hillfort), SH374782	Oval earthwork bank, 200m across, crossed through its western edge by the B5112 2 km NW of Gwalchmai in central Anglesey, Wales. Iron Age defensive double banked hillfort on a low hilltop, now quite faint on the ground, but the outline of which is retained in a hedge line west of the road.	Prehistoric (Iron Age)	AN042 [83]
	Dinas Gynfor Hillfort	Hillfort	Llanbadrig	53°25′39″N 4°25′25″W / 53.4274°N 4.4236°W / 53.4274; -4.4236 (Dinas Gynfor Hillfort), SH390950		Prehistoric	AN038 [84]
	Din Sylwy	Hillfort	Llanddona	53°18′39″N 4°07′22″W / 53.3108°N 4.1229°W / 53.3108; -4.1229 (Din Sylwy), SH586814	Also called Bwrdd Arthur, the earthworks enclose a relatively flat, partly overgrown area, 600 yards from the Irish Sea. Two entrances have been detected.	Prehistoric	AN024 [85]
	Castell near Tre-Fadog	Promontory Fort - coastal	Llanfaethlu	53°20′32″N 4°34′07″W / 53.3423°N 4.5686°W / 53.3423; -4.5686 (Castell Near Tre-Fadog), SH290858		Prehistoric	AN082 [86]
	Caer Idris Hillfort	Hillfort	Llanidan	53°11′15″N 4°15′17″W / 53.1874°N 4.2546°W / 53.1874; -4.2546 (Caer Idris Hillfort), SH494679		Prehistoric	AN051 [87]
	Dinas Cadnant Hillfort	Hillfort	Menai Bridge	53°14′16″N 4°10′16″W / 53.2377°N 4.1712°W / 53.2377; -4.1712 (Dinas Cadnant Hillfort), SH551733		Prehistoric	AN048 [88]
	Coed Newydd Boiling Mounds & Smelting Hearth	Burnt mound	Moelfre	53°20′51″N 4°16′17″W / 53.3475°N 4.2715°W / 53.3475; -4.2715 (Coed Newydd Boiling Mounds & Smelting Hearth), SH488858		Prehistoric	AN103 [89]
	Din Lligwy Hut Group	Enclosed hut circle	Moelfre	53°21′03″N 4°15′33″W / 53.3508°N 4.2592°W / 53.3508; -4.2592 (Din Lligwy Ancient Village), SH497861	Stone foundation walls of a group of Iron Age houses and workshops, surrounded by an enclosing wall.	Prehistoric	AN023 [90]
	Caer y Tŵr	Hillfort	Trearddur	53°18′47″N 4°40′29″W / 53.3131°N 4.6747°W / 53.3131; -4.6747 (Caer y Twr), SH219829	A Roman-era hillfort on the summit of the Holyhead Mountain. Now mostly rubble, but its walls can still be made out, including a large stone rampart on the north and east sides.	Prehistoric	AN019 [91]
	Dinas Porth Ruffydd	Hillfort	Trearddur	53°16′55″N 4°40′02″W / 53.2819°N 4.6673°W / 53.2819; -4.6673 (Dinas Porth Ruffydd), SH222794		Prehistoric	AN121 [92]
	Y Werthyr HIllfort	Hillfort	Tref Alaw	53°19′49″N 4°27′34″W / 53.3303°N 4.4594°W / 53.3303; -4.4594 (Y Werthyr HIllfort), SH363843	Bivallate hillfort on an imposing hill top. Ramparts are now mostly ploughed out.	Prehistoric	AN158 .[93]
	Capel Eithin (site of) and Cemetery	Chapel	Llanfihangel Ysgeifiog	53°13′45″N 4°15′48″W / 53.2293°N 4.2634°W / 53.2293; -4.2634 (Capel Eithin (site of) and Cemetery), SH490726		Prehistoric	AN120 [94]
	Bryn Eryr Rectangular Earthwork	Enclosure	Cwm Cadnant	53°15′28″N 4°11′21″W / 53.2578°N 4.1892°W / 53.2578; -4.1892 (Bryn Eryr Rectangular Earthwork), SH540756		Roman	AN100 [95]
	Hendrefor Earthwork	Enclosure	Cwm Cadnant	53°15′56″N 4°10′57″W / 53.2655°N 4.1825°W / 53.2655; -4.1825 (Hendrefor Earthwork), SH545765		Roman	AN075 [96]
	Caer Gybi Roman Fortlet	Fort	Holyhead	53°18′42″N 4°37′55″W / 53.3116°N 4.632°W / 53.3116; -4.632 (Caer Gybi Roman Fortlet), SH247826	Small fortlet at the centre of Holyhead. Possibly a late-4th-century outpost for Segontium, to defend Anglesey from Irish sea-raiders	Roman	AN031 [97]
	Parciau hill fort	Hillfort	Llaneugrad	53°20′15″N 4°15′46″W / 53.3374°N 4.2627°W / 53.3374; -4.2627 (Parciau Hillfort), SH494846		Roman	AN041 [98]
	Caer Lêb	Enclosure	Llanidan	53°10′55″N 4°17′12″W / 53.1819°N 4.2866°W / 53.1819; -4.2866 (Caer Leb), SH472674		Roman	AN014 [99]
	Bodafon Mountain Hut Groups	Enclosed hut circle	Moelfre	53°20′22″N 4°17′54″W / 53.3394°N 4.2983°W / 53.3394; -4.2983 (Bodafon Mountain Hut Groups), SH470849		Roman	AN040 [100]
	Pen-Sieri Inscribed Stone	Inscribed stone	Aberffraw	53°12′25″N 4°29′42″W / 53.2069°N 4.4951°W / 53.2069; -4.4951 (Pen-Sieri Inscribed Stone), SH334706	Early Christian memorial stones with the words 'MAILIS' [=(stone of Mail)], plus some Ogham text, suggesting 5th or 6th century date. In 1802 it was in use as a barn lintel. In 2002 it was relocated inside a farm building at Trecastell Farm.	Early Medieval	AN058 [101]
	Bodedern Early Christian Cemetery	Cemetery	Bodedern	53°17′26″N 4°29′23″W / 53.2906°N 4.4898°W / 53.2906; -4.4898 (Bodedern Early Christian Cemetery), SH341799		Early Medieval	AN099 [102]
	Bodfeddan Inscribed Stone	Inscribed stone	Llanfaelog	53°14′34″N 4°27′54″W / 53.2429°N 4.465°W / 53.2429; -4.465 (Bodfeddan Inscribed Stone), SH356745	Standing Stone 2m high, alongside the A4080 1 km north of Pencarnisiog. Inscribed on Northern face is the text CVNOGVS_HIC IACIT (the Stone of Cunogus(s)us He lies here). The text is dated to the 5th or 6th century AD, but a well-defined cup mark may indicate the stone is a prehistoric item.	Early Medieval	AN021 [103]
	Penmon Cross	Cross	Llangoed	53°18′21″N 4°03′24″W / 53.3058°N 4.0568°W / 53.3058; -4.0568 (Cross in Penmon Priory), SH630807		Early Medieval	AN063 [104]
	St Seiriol's Well, Penmon	Holy Well	Llangoed	53°18′23″N 4°03′24″W / 53.3064°N 4.0566°W / 53.3064; -4.0566 (St Seiriol's Well, Penmon), SH630808		Early Medieval	AN062 [105]
	Monastic Settlement on Puffin Island	Monastic settlement	Llangoed	53°19′09″N 4°01′31″W / 53.3193°N 4.0253°W / 53.3193; -4.0253 (Tower & Remains of Church and Monastic Settlement on Puffin Island), SH651821		Early Medieval	AN064 [106]
	Mynwent y Llwyn	Chapel?	Llangristiolus	53°13′57″N 4°18′36″W / 53.2325°N 4.31°W / 53.2325; -4.31 (Mynwent y Llwyn), SH459730	Broad mound on Malltraeth marsh, beside the old A5. It has long been suggested, and doubted, as the site of a chapel, however a resistivity survey in 1970 found the foundations of a rectangular building. The name means 'the burial ground of the grove'	Early Medieval?	AN065 [107]
	Llangaffo inscribed stones	Cross shaft	Rhosyr	53°11′28″N 4°19′40″W / 53.1911°N 4.3277°W / 53.1911; -4.3277 (Early Gravestones & Shaft in Churchyard), SH445685	In the churchyard of St Caffo's Church, Llangaffo, there is a part of a 9th-century stone cross, and inscribed gravestones from the 9th to 11th centuries	Early Medieval	AN053 [108]
	Beaumaris Castle	Castle	Beaumaris	53°15′54″N 4°05′23″W / 53.2649°N 4.0897°W / 53.2649; -4.0897 (Beaumaris Castle), SH607762	One of the most famous castles of Edward I. Part of the Castles and Town Walls of Gwynedd World Heritage site	Medieval	AN001 [109]
	Beaumaris Town Wall	Town Wall	Beaumaris	53°15′53″N 4°05′39″W / 53.2647°N 4.0941°W / 53.2647; -4.0941 (Beaumaris Town Wall), SH604762		Medieval	AN123 [110]
	Llanfaes Friary	Friary	Beaumaris	53°16′29″N 4°05′14″W / 53.2746°N 4.0871°W / 53.2746; -4.0871 (Site of Friary at Llanfaes), SH609773		Medieval	AN134 [111]
	Hafoty Medieval House	House (domestic)	Cwm Cadnant	53°16′51″N 4°09′28″W / 53.2809°N 4.1579°W / 53.2809; -4.1579 (Hafoty Old Farm House), SH562781		Medieval	AN097 [112]
	Castell Crwn	Ringwork	Cylch-y-Garn	53°23′16″N 4°30′35″W / 53.3879°N 4.5098°W / 53.3879; -4.5098 (Castell Crwn), SH331908		Medieval	AN029 [113]
	St Michael's Church, Llanfihangel Ysgeifiog	Church	Llanfihangel Ysgeifiog	53°14′10″N 4°16′51″W / 53.236°N 4.2809°W / 53.236; -4.2809 (Old Parish Church & Churchyard), SH478734		Medieval	AN052 [114]
	Plas Berw	House (domestic)	Llanfihangel Ysgeifiog	53°13′14″N 4°17′57″W / 53.2206°N 4.2993°W / 53.2206; -4.2993 (Plas Berw), SH465717		Medieval	AN057 [115]
	Tre-Garnedd Moated Site	Moated Site	Llangefni	53°14′48″N 4°17′47″W / 53.2466°N 4.2964°W / 53.2466; -4.2964 (Tre-Garnedd Moated Site), SH468746		Medieval	AN047 [116]
	Aberlleiniog Castle	Motte	Llangoed	53°17′33″N 4°04′38″W / 53.2926°N 4.0772°W / 53.2926; -4.0772 (Aberlleiniog Castle), SH616793	Civil War stone fortifications on a medieval motte	Medieval	AN020 [117]
	Penmon Priory	Priory	Llangoed	53°18′20″N 4°03′24″W / 53.3055°N 4.0568°W / 53.3055; -4.0568 (Penmon Priory), SH630807	Early medieval religious foundation that was an Augustinian Priory by 1237	Medieval	AN027 [118]
	Old Church of St Nidan, Llanidan	Church	Llanidan	53°10′40″N 4°15′13″W / 53.1779°N 4.2535°W / 53.1779; -4.2535 (Old Parish Church), SH494669		Medieval	AN054 [119]
	Capel Lligwy	Chapel	Moelfre	53°21′08″N 4°15′23″W / 53.3523°N 4.2564°W / 53.3523; -4.2564 (Capel Lligwy), SH499863		Medieval	AN056 [120]
	Ffynnon Allgo (St Allgo's Well)	Holy Well	Moelfre	53°20′19″N 4°15′21″W / 53.3385°N 4.2559°W / 53.3385; -4.2559 (Ffynnon Allgo), SH498847		Medieval	AN068 [121]
	Traeth Lligwy Fish Weir	Fish weir	Moelfre	53°21′38″N 4°15′20″W / 53.3606°N 4.2555°W / 53.3606; -4.2555 (Traeth Lligwy Fish Weir), SH500872	Fish trap built as a crescent of rocks near the low-tide mark of Lligwy Bay, near Moelfre, Anglesey. It is of uncertain date, is covered at high-tide, and was used to trap fish in the pond it creates at low-tide.	Medieval	AN144 [122]
	St Gwenfaen's Well	Holy Well	Rhoscolyn	53°14′50″N 4°36′36″W / 53.2473°N 4.6101°W / 53.2473; -4.6101 (Ffynnon Gwenfaen), SH259754	An early medieval holy well in the south west of Holy Island, named after St Gwenfaen, whose cloister was nearby. Also known as Welsh: Ffynnon Gwenfaen.	Medieval	AN055 [123]
	Pen-y-Fynwent Enclosure	Enclosure	Rhosybol	53°22′24″N 4°21′22″W / 53.3732°N 4.356°W / 53.3732; -4.356 (Pen-y-Fynwent Enclosure), SH433888	Medieval or pre-medieval homestead enclosure, and suggested site of a chapel. The enclosure survives as a low bank. No trace now remains of the chapel, which 19th century sources named variously as Bettws Bwchwdw, Capel Tegeryn, and a Church dedicated to St Morwenna. A Bronze Age Mound (AN125) is in the same field.	Medieval	AN124 [124]
	Llys Rhosyr	Manor	Rhosyr	53°09′43″N 4°21′58″W / 53.162°N 4.3661°W / 53.162; -4.3661 (Llys Rhosyr), SH419653	Thirteenth century llys, a court of the princes of Gwynedd, excavated in 1993. It went out of use during the 14th century when the nearby 'new borough' was founded, and the llys was buried by the dunes.	Medieval (13th century)	AN129 [125]
	St Dwynwen's Church	Church	Rhosyr	53°08′14″N 4°24′48″W / 53.1373°N 4.4132°W / 53.1373; -4.4132 (St Dwynwen's Church), SH387627		Medieval	AN046 [126]
	Pont Aberffraw	Bridge	Aberffraw	53°11′32″N 4°27′45″W / 53.1921°N 4.4625°W / 53.1921; -4.4625 (Pont Aberffraw), SH355689	Bridge over the Afon Ffraw at Aberffraw, built by Sir A. Owen in 1731. A walled causeway continues to the east over the large expanse of sand dunes of Tywyn Aberffraw. The bridge is now only open to pedestrians.	Post-Medieval /Modern	AN101 [127]
	Parys Mountain	Tower	Amlwch	53°23′11″N 4°20′41″W / 53.3865°N 4.3448°W / 53.3865; -4.3448 (Parys Mountain: Windmill, Engine House, Precipitation Pits and Great Opencast), SH441903	Windmill, Engine House, Precipitation Pits and Great Opencast	Post-Medieval /Modern	AN111 [128]
	Gorad Friars Bach Fish Weir	Fish weir	Beaumaris	53°16′41″N 4°04′43″W / 53.2781°N 4.0787°W / 53.2781; -4.0787 (Gorad Friars Bach Fish Weir), SH615777		Post-Medieval /Modern	AN140 [129]
	Llanddona Fish Weir	Fish weir	Llanddona	53°18′29″N 4°08′38″W / 53.3081°N 4.1439°W / 53.3081; -4.1439 (Llanddona Fish Weir), SH572812	A post medieval intertidal fish trap at the eastern end of the beach at Red Wharf Bay near Llanddona.	Post-Medieval /Modern	AN137 [130]
	Parciau Dovecot	Dovecote	Llaneugrad	53°19′51″N 4°15′27″W / 53.3309°N 4.2576°W / 53.3309; -4.2576 (Parciau Dovecot), SH497839		Post-Medieval /Modern	AN036 [131]
	Coed Mor Fish Weir	Fish weir	Llanfair Pwllgwyngyll	53°13′08″N 4°11′03″W / 53.2188°N 4.1841°W / 53.2188; -4.1841 (Coed Mor Fish Weir), SH542713		Post-Medieval /Modern	AN138 [132]
	Gorad Ddu Fish Weir	Fish weir	Llanfair Pwllgwyngyll	53°13′17″N 4°10′47″W / 53.2214°N 4.1797°W / 53.2214; -4.1797 (Gorad Ddu Fish Weir), SH545715		Post-Medieval /Modern	AN139 [133]
	North Weir and Smoke Tower, Ynys Gorad Goch	Fish weir	Llanfair Pwllgwyngyll	53°13′07″N 4°10′53″W / 53.2187°N 4.1813°W / 53.2187; -4.1813 (North Weir and Smoke Tower, Ynys Gorad Goch), SH544712		Post-Medieval /Modern	AN096 [134]
	Felin Carnau Tide Mill	Tidemill	Llanfair-yn-Neubwll	53°15′15″N 4°33′05″W / 53.2541°N 4.5514°W / 53.2541; -4.5514 (Felin Carnau Tide Mill), SH298760		Post-Medieval /Modern	AN131 [135]
	Felin Wen Tide Mill	Tidemill	Llanfair-yn-Neubwll	53°15′52″N 4°33′23″W / 53.2644°N 4.5565°W / 53.2644; -4.5565 (Felin Wen Tide Mill), SH295772		Post-Medieval /Modern	AN130 [136]
	Aberlleiniog Fish Weir I	Fish weir	Llangoed	53°17′25″N 4°04′02″W / 53.2902°N 4.0672°W / 53.2902; -4.0672 (Aberlleiniog Fish Weir I), SH625792		Post-Medieval /Modern	AN142 [137]
	Aberlleiniog Fish Weir II	Fish weir	Llangoed	53°17′28″N 4°03′46″W / 53.2911°N 4.0628°W / 53.2911; -4.0628 (Aberlleiniog Fish Weir II), SH625793		Post-Medieval /Modern	AN143 [138]
	Penmon Dovecote	Dovecote	Llangoed	53°18′20″N 4°03′21″W / 53.3056°N 4.0557°W / 53.3056; -4.0557 (Penmon Dovecot), SH631807		Post-Medieval /Modern	AN061 [139]
	Trecastell Fish Weir	Fish weir	Llangoed	53°17′10″N 4°04′12″W / 53.2862°N 4.07°W / 53.2862; -4.07 (Trecastell Fish Weir), SH621786		Post-Medieval /Modern	AN141 [140]
	Bodafon Mountain Early Medieval Homestead	Settlement	Moelfre	53°20′13″N 4°17′51″W / 53.3369°N 4.2976°W / 53.3369; -4.2976 (Bodafon Mountain Early Medieval Homestead), SH471846		Post-Medieval /Modern	AN039 [141]
	Bodior Tide Mill	Tidemill	Rhoscolyn	53°15′38″N 4°34′07″W / 53.2605°N 4.5685°W / 53.2605; -4.5685 (Bodior Tide Mill), SH287767		Post-Medieval /Modern	AN132 [142]
	Hendai Medieval Farmstead	Farmstead	Rhosyr	53°08′49″N 4°23′11″W / 53.1469°N 4.3864°W / 53.1469; -4.3864 (Hendai Medieval Farmstead), SH404637		Post-Medieval /Modern	AN108 [143]
	Newlands Fish Weir	Fish weir	Valley	53°17′44″N 4°33′53″W / 53.2955°N 4.5646°W / 53.2955; -4.5646 (Newlands Fish Weir), SH290807		Post-Medieval /Modern	AN145 [144]
	Dyffryn Adda Copper Furnace and Precipitation Ponds	Copper mine	Amlwch	53°23′46″N 4°21′02″W / 53.396°N 4.3506°W / 53.396; -4.3506 (Dyffryn Adda Copper Furnace and Precipitation Ponds), SH438913		Post-Medieval /Modern	AN135 [145]
	Mona Mine	Copper mine	Amlwch	53°23′14″N 4°20′15″W / 53.3872°N 4.3375°W / 53.3872; -4.3375 (Mona Mine Kilns and Sublimation Chambers, Mynydd Parys), SH446903	Kilns and Sublimation Chambers at Mona Mine, Mynydd Parys	Post-Medieval /Modern	AN136 [146]
	Porth Wen Brickworks	Brickworks	Llanbadrig	53°25′26″N 4°24′23″W / 53.424°N 4.4065°W / 53.424; -4.4065 (Porth Wen Brickworks), SH401946	A now disused Victorian brickworks which produced fire bricks. The substantial remains include a number of buildings and the remains of some of the machinery.	Post-Medieval /Modern	AN109 [147]
	Quay on the Stanley Embankment	Quay	Valley	53°17′20″N 4°34′44″W / 53.289°N 4.5789°W / 53.289; -4.5789 (The Holyhead Road: quay on the Stanley Embankment), SH281999	The Quay is the best preserved element of Thomas Telford's Stanley Embankment, the causeway between Holyhead and Anglesey. It was built in 1823 as the final link in the London to Holyhead Road. The angles of the masonry walls allowed ships to moor alongside the large unloading area. The main change in the original design is the addition of a higher parapet.	Post-Medieval /Modern	AN146 [148]
	Berw Colliery	Colliery	Llanfihangel Ysgeifiog	53°13′37″N 4°18′11″W / 53.2269°N 4.3031°W / 53.2269; -4.3031 (Berw Colliery), SH463724		Post-Medieval /Modern	AN152 [149]

Scheduled Monuments in Isle of Anglesey, Wales.
=Prehistoric =Roman =Early Medieval
=Medieval =Post-Medieval/Modern

See also

• List of Cadw properties
• List of castles in Wales
• List of hill forts in Wales
• Historic houses in Wales
• List of monastic houses in Wales
• List of museums in Wales
• List of Roman villas in Wales

References

• Coflein is the online database of RCAHMW: Royal Commission on the Ancient and Historical Monuments of Wales, GAT is the Gwynedd Archaeological Trust, Cadw is the Welsh Historic Monuments Agency