Castell Dyffryn Mawr

Has been described as a Possible Timber Castle (Ringwork), and also as a Possible Masonry Castle

There are earthwork remains

NameCastell Dyffryn Mawr
Alternative NamesLlanfair Nant Gwyn; Parc y Domen
Historic CountryPembrokeshire
Modern AuthorityPembrokeshire
1974 AuthorityDyfed

Ringwork, walled in stone slabs, probably laid in clay or poor mortar. No known history. (King)

A probable castle mound, subsequently modified as a landscape feature: a circular ditched mound, some 20m in diameter, rising 5.5m from base of the generally 3.0m deep ditch; the dished summit of the mound is defined by a roughly 1.6m wide stony bank: a recent bank, some 45m in diameter, surrounds the work, OS County series (Pembroke. XI.4 1889) portraying this bank as tree-planted, with a conifer(s?)on the mound. (Coflien)

This is a fine Norman mound ..., about 50 yards to the south-east of Dyffryn Mawr farm-house. It rises to a height of over 20 feet from the bottom of the surrounding ditch. The centre of the summit, which is 60 feet in diameter, has a saucer-like depression of some 10 feet. Around this basin are the stone foundations (5.5 feet wide) of what was probably the turret of an early manor house. The ditch is 8 feet wide and 10 feet deep ; the counterscarp is crowned with a thick quickset hedge. There are no signs of a bailey. The field on which the mound stands is still known as Pare y domen (Tithe Schedule, No. 357). In the spring of 1920 a narrow trench was driven into the west side of the mound, revealing two-post holes, each about one foot square, in the hard soil just outside the stone foundations. At the foot of each hole was a bed of decayed timber a foot thick. (RCAHMW)

Gatehouse Comments

The stone work may well be a drystone wall around the mound built to protect the trees recorded in Coflien when first planted, seems unlikely as a masonry castle and the isolated location may well put question on this being a castle site of any type. The presence of substantial timbers does mean some structure here and many authors have accepted this as a castle.

- Philip Davis

This site is a scheduled monument protected by law

Not Listed

The National Monument Record (Coflein) number(s)
County Historic Environment Record
OS Map Grid ReferenceSN174351
HyperLink HyperLink HyperLink
Copyright Dave Barlow of Abaroths World All Rights ReservedView full Sized Image
Copyright Dave Barlow of Abaroths World All Rights ReservedView full Sized Image

Most of the sites or buildings recorded in this web site are NOT open to the public and permission to visit a site must always be sought from the landowner or tenant.

Calculate Print


  • Morgan, Gerald, 2008, Castles in Wales: A Handbook (Talybont: Y Lolfa Cyf.) p. 248 (listed)
  • Hull, Lise, 2005, Castles and Bishops Palaces of Pembrokeshire (Logaston Press) p. 88
  • Pettifer, Adrian, 2000, Welsh Castles, A Guide by Counties (Boydell Press) p. 178
  • Davis, Paul, 2000, A Company of Forts. A Guide to the Medieval Castles of West Wales (Gomer Press) p. 32-3
  • Reid, Alan, 1998, Castles of Wales (John Jones Publishing) p. 52
  • Salter, Mike, 1996, The Castles of South West Wales (Malvern) p. 86 (slight)
  • Miles, Dillwyn, 1979 (Revised 1988), Castles of Pembrokeshire (Pembrokeshire Coast National Park) p. 5-7
  • King, D.J.C., 1983, Castellarium Anglicanum (London: Kraus) Vol. 2 p. 393
  • RCAHMW, 1925, An inventory of the Ancient Monuments of Pembrokeshire (HMSO) p. 163 no. 461 online copy


  • Hogg, A.H.A. and King, D.J.C., 1967, 'Masonry castles in Wales and the Marches: a list' Archaeologia Cambrensis Vol. 116 p. 71-132
  • King, D.J.C. and Alcock, L., 1969, 'Ringworks in England and Wales' Ch√Ęteau Gaillard Vol. 3 p. 90-127
  • Hogg, A.H.A. and King, D.J.C., 1963, 'Early castles in Wales and the Marches: a preliminary list' Archaeologia Cambrensis Vol. 112 p. 77-124