Felin Isaf Motte, Llantrisant

Has been described as a Certain Timber Castle (Motte)

There are earthwork remains

NameFelin Isaf Motte, Llantrisant
Alternative Names
Historic CountryGlamorgan
Modern AuthorityVale of Glamorgan
1974 AuthoritySouth Glamorgan

A sub-circular mound, c.35-7m in diameter and 1.5-4.0m high. Before construction of enveloping industrial estate, the mound was ditched, with a c.28m by 32m, sub-rectangular bailey enclosure on the NW. (Coflein)

A mound with a surrounding ditch is almost certainly a motte. The sides of the mound are steep and the height varies. Faint indications of an attached bailey found during survey work. (Glamorgan-Gwent Archaeological Trust HER)

The monument comprises the remains of a motte and ditch, dating to the medieval period (c. 1066 -1540 AD). A motte is a large conical or pyramidal mound of soil and/or stone, usually surrounded by either a wet or dry ditch, and surmounted by a tower constructed of timber or stone. The motte measures c. 4m high and stands beside the old river bed of the Ely. On the north-west side there is a ramp to the top about 4m wide. The ditch, which survives best on the east, averages 8.5m wide and 0.6m deep. There is no sign of an outer bailey. (Scheduling Report)

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 ReferenceST060792
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  • Morgan, Gerald, 2008, Castles in Wales: A Handbook (Talybont: Y Lolfa Cyf.) p. 239 (listed)
  • Pettifer, Adrian, 2000, Welsh Castles, A Guide by Counties (Boydell Press) p. 111
  • < >RCAHMW, 1991, An Inventory of the Ancient Monuments in Glamorgan Vol. 3 Part 1a: The Early Castles (London: HMSO) < > MO2 p. 54-6
  • Salter, Mike, 1991, The Castles of Gwent, Glamorgan and Gower (Malvern) p. 75 (slight)
  • King, D.J.C., 1983, Castellarium Anglicanum (London: Kraus) Vol. 1 p. 165
  • Hague, D.B., 1971, in Pugh, T.B. (ed), Glamorgan County History Vol. 3 The Middle Ages (Cardiff) p. 440


  • Spurgeon, C.J. and Thomas, H.J., 1978, 'Medieval Glamorgan' Morgannwg Vol. 22 p. 18 online copy
  • Spurgeon, C.J. and Thomas, H.J., 1976, ‘Felin Isaf mound’, Archaeology in Wales Vol. 16 p. 40
  • 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