LiDAR 1m DTM Hillshade
Satellite Imagery
LiDAR 1m DTM Hillshade
Satellite Imagery
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HER: Gwynedd 404 (None)
NMR: SH 57 NW 21 (300872)
SM: None
NGR: SH53777849
X: 253770 Y: 378490 (OSGB36)
Small inland promontory hillfort located on rocky spur above Red Wharf Bay taking full advantage of the topography on S side of Mynydd Llwydiarth. Surrounding slopes very steep to E, S and W, less so on NE. Measures c. 110m E-W by 50m with internal area 0.3ha. Fragments of dry-stone wall c. 2m thick and to 0.5m high remain along edges of promontory at top of steep slopes, and terminate across neck on NE with deeply inturned entrance. The promontory forms a natural 'citadel 'of rock with a very steep drop on its three sides and here appears to be no additional works, although a modern wall constructed here could have destroyed anything before. No ditch. E entrance, with walls turning in along a natural scarp, thus forming a funnel-shaped passage similar to Caer y T_r (Atlas No 1738) Remains of stone roundhouses once visible at NE near entrance and just outside partly blocking it, possibly of later date. Site afforested and difficult to assess. Minimal investigations, undated.
Citizen Science: ✗
Reliability of Data: Confirmed
Reliability of Interpretation: Confirmed
X: -466977 Y: 7035545 (EPSG: 3857)
Longitude: -4.194923990150117 Latitude: 53.28314581620457 (EPSG:4326)
Country: Wales
Current County or Unitary Authority: Isle of Anglesey
Historic County: Anglesey
Current Parish/Community/Council/Townland: Pentraeth
Public access - Forestry Commission. Difficult to say whether earlier destroyed in part or not.
| Extant | ✓ |
| Cropmark | ✗ |
| Likely Destroyed | ✗ |
Site afforested which makes interpretation difficult.
| Woodland | ✗ |
| Commercial Forestry Plantation | ✓ |
| Parkland | ✗ |
| Pasture (Grazing) | ✗ |
| Arable | ✗ |
| Scrub/Bracken | ✓ |
| Bare Outcrop | ✗ |
| Heather/Moorland | ✗ |
| Heath | ✗ |
| Built-up | ✗ |
| Coastal Grassland | ✗ |
| Other | ✗ |
Small inland promontory hillfort located on rocky spur above Red Wharf Bay taking full advantage of the topography on S side of Mynydd Llwydiarth. Surrounding slopes very steep to E, S and W, less so on NE.
| 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: Rocky spur
| North | ✗ |
| Northeast | ✗ |
| East | ✗ |
| Southeast | ✗ |
| South | ✗ |
| Southwest | ✓ |
| West | ✗ |
| Northwest | ✗ |
| Level | ✗ |
Altitude: 120.0m
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 |
RCAHMW investigation 1937 inventory. Ordnance Survey investigation 1970. Forest Enterprise Welsh Historic Assets Project: Penllyn Archaeological Assessment 1999. GAT prehistoric defended enclosures survey 2004-2005.
| Other (1970): | Ordnance Survey investigation. |
| Other (1999): | Forest Enterprise Welsh Historic Assets Project. |
| Other (None): | RCAHMW investigation. |
| Other (None): | GAT prehistoric defended enclosures survey. |
Remains of stone roundhouses once visible at E near entrance and just outside partly blocking it.
Stream 0.45km outside fort.
| None | ✓ |
| Spring | ✗ |
| Stream | ✗ |
| Pool | ✗ |
| Flush | ✗ |
| Well | ✗ |
| Other | ✗ |
Remains of stone roundhouses once visible at E near entrance and just outside partly blocking it.
| 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 | ✗ |
None
| No Known Finds | ✓ |
| Pottery | ✗ |
| Metal | ✗ |
| Metalworking | ✗ |
| Human Bones | ✗ |
| Animal Bones | ✗ |
| Lithics | ✗ |
| Environmental | ✗ |
| Other | ✗ |
None
| APs Not Checked | ✓ |
| None | ✗ |
| Roundhouses | ✗ |
| Rectangular Structures | ✗ |
| Pits | ✗ |
| Postholes | ✗ |
| Roads/Tracks | ✗ |
| Other | ✗ |
E entrance, with deeply inturned walls, turning in along a natural scarp, thus forming a funnel-shaped passage similar to Caer y Twr.
| 1: | None |
| 2: | None |
Guard Chambers: ✗
Chevaux de Frise: ✗
| 1. In-turned (North east): | Deeply inturned forming funnel-shaped passage. |
| 1. Passage-way/Corridor (North east): | Deeply inturned forming funnel-shaped passage. |
Fragments of dry stone wall c. 2m thick and to 0.5m high remain along edges of promontory at top of steep slopes, and terminate across neck on NE. The promontory forms a natural 'citadel 'of rock with a very steep drop on its three sides and here appears to be no additional works, although a modern wall constructed here could have destroyed anything before. No ditch. 0.3ha enclosed.
| Area 1: | 0.3ha. |
| Total: | 0.3ha. |
Total Footprint Area: Noneha.
None
| ✗ | None |
| ✗ | None |
| NE Quadrant: | 1 |
| SE Quadrant: | 0 |
| SW Quadrant: | 0 |
| NW Quadrant: | 0 |
| 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 |
| ✗ | No ditch visible. |
Number of Ditches: 0
| ✗ | None |
Brooks, I. and Price, J. 1999. Penllyn Archaeological Assessment, Unpublished Forest Enterprise report, Forest Enterprise.
Lynch, F. 1991. Prehistoric Anglesey, Llangefni: Anglesey Antiquarian Society, 267-268.
RCAHMW 1937 (reprinted 1960). Anglesey. A survey and inventory by the Royal Commission on Ancient and Historical Monuments in Wales and Monmouthshire, 140, 6, 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:
Wikidata:
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