Gwynedd Archaeological Trust
Regional Historic Environment Record

Dinas Promontory Fort, Porth Ruffydd

Primary Reference Number (PRN) : 807
Trust : Gwynedd
Community : Trearddur
Unitary authority : Ynys Mon
NGR : SH22277941
Site Type (preferred type first) : Prehistoric PROMONTORY FORT
Status : Scheduled Ancient Monument

Description :
Possible example of native fort: promontory is surrounded by precipitous cliffs and almost isolated from mainland. Only artificial defence is low grass-grown bank of stones, (average height 2.5ft) running along whole length of chasm edge. <1>

Condition: good, visible on APs (05/66/16/103-4: 3-4-66): as described by RCAHM. <2>

No apparent change from description given in 1967. <3>

Scheduled in 1981. <4>

Damage to interior caused by metal detectors finding coin, pottery, spindle whorl and bucket-mounts (see PRN1748). <5>

A small cliff promontory, isolated by erosion. It is edged with a bank on the two sides that are more accessible. There are some slight terraces inside that might be round hut platforms and there is a small but deep circular pond. There have been several metal detectorist finds of 2nd-3rd century AD date. (Smith, 2005)

The promontory slopes gently from west down to east, where the slope and the rampart come quite close to high tide level. The only possible settlement features are 3 or 4 slight possible circular platforms on the mid-slope on the east side - the only part of the promontory that has any kind of shelter from the westerly wind. Just above these is a small circular, artificially made pool in an embanked area. The bottom of the pool could not be bottomed at about 1m deep which itself is about 1m below the crest of the bank. Not previously recorded. On the outside of the landward side of the rampart and attached to it is a small circular embanked enclosure, function uncertain. If there was an entrance it could have been a guard chamber. (Smith, 2005)

Sources :
Smith, G. , 2003 , Prehistoric Defended Enclosures: Scoping for Pan-Wales Assessment ( © GAT)
Smith, G. , 2005 , A Survey of Prehistoric Defended Enclosures in North West Wales 2004-2005: West Conwy, Gwynedd (Arfon) & Anglesey ( © GAT)
Smith, G. , 2008 , Iron Age Settlements in Wales: Cadw Defended Enclosures Publication Hillforts and Hut Groups in North-West Wales ( © GAT)
Waddington, K. , 2010 , Early Celtic Societies in North Wales
Waddington, K. , 2013 , The Settlements of Northwest Wales: From the Late Bronze Age to the Early Medieval Period
Royal Commission on Ancient and Historic Monuments , 1937 , Anglesey , <1>
Ordnance Survey , 1967 , SH27NW 1 , <2>
Ordnance Survey , 1970 , SH27NW 1 , <3>
, 1981 , Ancient Monuments List for Wales , <4>
White, R. B. , 1978 , PRN 807 , <5>
White, R. B. , 1978 , PRN 807 , <6>

Events :
41535 : Prn 807 25 Inch Survey (year : 1967)
40621 : Prehistoric Defended Enclosures in North-west Wales, 2004-5: West Conwy, Gwynedd (Arfon) and Anglesey (year : 2005)
44557 : Early Celtic Societies in North Wales (year : 2010)
45042 : Iron Age Settlements in Wales: Cadw Defended Enclosures Publication. Hillforts and Hut Groups in North-West Wales. (year : 2008)
40620 : Prehistoric Defended Enclosures: Scoping for Pan-Wales Assessment (year : 2003)

Related PRNs : 308070

Compiled date :


Images :



The above data are supplied by GAT in partnership with its Local Authorities (Anglesey, Conwy and Gwynedd County Councils, and Snowdonia National Park Authority), © GAT 2018 (and in part © Crown, 2018 - as indicated)
This information is supplied for the purposes of personal interest only and may not be used as part of a commercial project.

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