LiDAR 1m DTM Hillshade
Satellite Imagery
LiDAR 1m DTM Hillshade
Satellite Imagery
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HER: Gwynedd 807 (None)
NMR: SH 27 NW 1 (308070)
SM: AN121
NGR: SH22277941
X: 222270 Y: 379410 (OSGB36)
Coastal promontory fort located on S-facing off-shore headland/islet between Porth Ruffydd on W and Porth Dafarch on E. Precipitous sea cliffs on E, S and W. Landward on N almost cut off from mainland by cliff-lined E-W chasm, now to be crossed only via a low boulder-filled causeway. This is a good example of the effects of coastal erosion, and the plan of the site today is not as it was in prehistory. Slight slope to S/level site measuring c. 140m E-W by 80m, with internal area c. 1.1ha. Site now defined by low stony grass-covered bank, much spread, which runs along the lip of this chasm facing the sea and which turns S at its E end. This, no doubt, stone wall is c. 5m wide rising 0.8m above interior. No ditch. Possible roundhouse platforms visible on aerial photographs. No entrance defined. Coastal grassland, but much of interior bare rock. Much spread and difficult to see. Illegal metal detector finds include coin of Carausius (AD 286-93), pottery, spindle whorl and bucket-mounts. Shown on OS 1:25,000 map (1937-1961). Minimal investigations, undated.
Citizen Science: ✗
Reliability of Data: Confirmed
Reliability of Interpretation: Confirmed
X: -519576 Y: 7035291 (EPSG: 3857)
Longitude: -4.6674290090392185 Latitude: 53.28178017098966 (EPSG:4326)
Country: Wales
Current County or Unitary Authority: Isle of Anglesey
Historic County: Anglesey
Current Parish/Community/Council/Townland: Trearddur
Much spread and difficult to see.
| Extant | ✓ |
| Cropmark | ✗ |
| Likely Destroyed | ✓ |
Exposed coastal grassland and bare rock.
| Woodland | ✗ |
| Commercial Forestry Plantation | ✗ |
| Parkland | ✗ |
| Pasture (Grazing) | ✗ |
| Arable | ✗ |
| Scrub/Bracken | ✗ |
| Bare Outcrop | ✗ |
| Heather/Moorland | ✗ |
| Heath | ✗ |
| Built-up | ✗ |
| Coastal Grassland | ✓ |
| Other | ✗ |
Coastal promontory fort located on S-facing headland/islet between Porth Ruffydd on W and Porth Dafarch on E. Precipitous sea cliffs on E, S and W. Landward on N almost cut off from mainland by cliff-lined E-W chasm.
| Contour Fort | ✗ |
| Partial Contour Fort | ✗ |
| Promontory Fort | ✓ |
| Hillslope Fort | ✗ |
| Level Terrain Fort | ✗ |
| Marsh Fort | ✗ |
| Multiple Enclosure Fort | ✗ |
| Hilltop | ✗ |
| Coastal Promontory | ✓ |
| Inland Promontory | ✗ |
| Valley Bottom | ✗ |
| Knoll/Hillock/Outcrop | ✗ |
| Ridge | ✗ |
| Cliff/Plateau-edge/Scarp | ✗ |
| Hillslope | ✗ |
| Lowland | ✗ |
| Spur | ✗ |
Dominant Topographic Feature: Coastal headland
| North | ✗ |
| Northeast | ✗ |
| East | ✗ |
| Southeast | ✗ |
| South | ✓ |
| Southwest | ✗ |
| West | ✗ |
| Northwest | ✗ |
| Level | ✗ |
Altitude: 20.0m
N/A
None
Reliability: D - None
| Pre 1200BC | ✗ |
| 1200BC - 800BC | ✗ |
| 800BC - 400BC | ✗ |
| 400BC - AD50 | ✗ |
| AD50 - AD400 | ✗ |
| AD400 - AD 800 | ✗ |
| Post AD800 | ✗ |
| Unknown | ✓ |
| Pre Hillfort: | None |
| Post Hillfort: | None |
On OS 1:25,000 map (1937-1961). Ordnance Survey observation 1967, 1970. GAT prehistoric defended enclosures survey 2004-2005.
| 1st Identified Map Depiction (None): | OS map. |
| Other (None): | Ordnance Survey observation. |
| Other (None): | GAT prehistoric defended enclosures survey. |
Finds include coin of Carausius (AD 286-93), pottery, spindle whorl and bucket-mounts. Possible roundhouse sites visible on aerial photographs.
None
| None | ✓ |
| Spring | ✗ |
| Stream | ✗ |
| Pool | ✗ |
| Flush | ✗ |
| Well | ✗ |
| Other | ✗ |
None
| No Known Features | ✓ |
| Round Stone Structures | ✗ |
| Rectangular Stone Structures | ✗ |
| Curvilinear Platforms | ✗ |
| Other Roundhouse Evidence | ✗ |
| Pits | ✗ |
| Quarry Hollows | ✗ |
| Other | ✗ |
None
| No Known Excavation | ✓ |
| Pits | ✗ |
| Postholes | ✗ |
| Roundhouses | ✗ |
| Rectangular Structures | ✗ |
| Roads/Tracks | ✗ |
| Quarry Hollows | ✗ |
| Other | ✗ |
| Nothing Found | ✗ |
None
| No Known Geophysics | ✓ |
| Pits | ✗ |
| Roundhouses | ✗ |
| Rectangular Structures | ✗ |
| Roads/Tracks | ✗ |
| Quarry Hollows | ✗ |
| Other | ✗ |
| Nothing Found | ✗ |
Illegal metal detector finds include coin of Carausius (AD 286-93), pottery, spindle whorl and bucket-mounts.
| No Known Finds | ✗ |
| Pottery | ✓ |
| Metal | ✓ |
| Metalworking | ✗ |
| Human Bones | ✗ |
| Animal Bones | ✗ |
| Lithics | ✗ |
| Environmental | ✗ |
| Other | ✓ |
Possible roundhouse platforms visible on aerial photographs.
| APs Not Checked | ✗ |
| None | ✗ |
| Roundhouses | ✓ |
| Rectangular Structures | ✗ |
| Pits | ✗ |
| Postholes | ✗ |
| Roads/Tracks | ✗ |
| Other | ✗ |
No entrance defined.
| 0: | None |
| 2: | None |
Guard Chambers: ✗
Chevaux de Frise: ✗
Site now defined by low stony grass-covered bank, now much spread, which runs along the lip of this chasm facing the sea and which turns S at its E end. This, no doubt stone, wall is c. 5m wide rising 0.8m above interior. No ditch.
| Area 1: | 1.1ha. |
| Total: | 1.1ha. |
Total Footprint Area: Noneha.
None
| ✗ | Area not defined. |
| ✗ | Wall on N cuts off promontory. |
| NE Quadrant: | 1 |
| SE Quadrant: | 0 |
| SW Quadrant: | 0 |
| NW Quadrant: | 1 |
| Total: | 1 |
| Partial Univallate | ✓ |
| Univallate | ✗ |
| Partial Bivallate | ✗ |
| Bivallate | ✗ |
| Partial Multivallate | ✗ |
| Multivallate | ✗ |
| Unknown | ✗ |
| Partial Univallate | ✗ |
| Univallate | ✗ |
| Partial Bivallate | ✗ |
| Bivallate | ✗ |
| Partial Multivallate | ✗ |
| Multivallate | ✗ |
Stone-walled site.
| None | ✗ |
| Earthen Bank | ✗ |
| Stone Wall | ✓ |
| Rubble | ✗ |
| Wall-walk | ✗ |
| Evidence of Timber | ✗ |
| Vitrification | ✗ |
| Other Burning | ✗ |
| Palisade | ✗ |
| Counter Scarp Bank | ✗ |
| Berm | ✗ |
| Unfinished | ✗ |
| Other | ✗ |
None
| None | ✗ |
| Earthen Bank | ✗ |
| Stone Wall | ✗ |
| Murus Duplex | ✗ |
| Timber-framed | ✗ |
| Timber-laced | ✗ |
| Vitrification | ✗ |
| Other Burning | ✗ |
| Palisade | ✗ |
| Counter Scarp Bank | ✗ |
| Berm | ✗ |
| Unfinished | ✗ |
| No Known Excavation | ✓ |
| Other | ✗ |
| ✗ | None |
| ✗ | None |
Number of Ditches: 0
| ✗ | None |
Lynch, F. 1991. Prehistoric Anglesey, Llangefni: Anglesey Antiquarian Society, 236-37.
RCAHMW 1937 (reprinted 1960). Anglesey. A survey and inventory by the Royal Commission on Ancient and Historical Monuments in Wales and Monmouthshire, 24, London: HMSO.
Smith, G. H. 2005 , A Survey of Prehistoric Defended Enclosures in North West Wales 2004-2005: West Conwy, Gwynedd (Arfon) and Anglesey, Bangor: Gwynedd Archaeological Trust.
Waddington, K. 2013. The Settlements of Northwest Wales: From the Late Bronze Age to the Early Medieval Period, Cardiff: University of Wales Press.
Atlas of Hillforts:
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This work is licensed under CC BY-SA 4.0
and should be cited as:
Lock, Gary and Ralston, Ian. 2024. Atlas of Hillforts of Britain and Ireland. Available at: https://hillforts.arch.ox.ac.uk
Document Version 1.1