Castle in Gwerthrynion

Has been described as a Possible Timber Castle (Other/Unknown)

There are uncertain remains

NameCastle in Gwerthrynion
Alternative Names
Historic CountryRadnorshire
Modern AuthorityPowys
1974 AuthorityPowys

Unidentified castle mentioned in 1202. Remfry writes (pers corr) 'Castle in Gwerthrynion is probably Rhayadr on east bank of Wye as opposed to Rhayadr-Gwy on west bank. Might be the 'ringwork' at Cwm y Saesson above St Harmons. Point needs emphasising that there were 2 castles at Rhayadr, Mortimer on east bank with deep ditch, c.1200 and Rhys ap Gruffydd on Welsh bank with motte, c.1170's.' Would have been a timber castle as recorded as burnt to ground.

Gatehouse Comments

The term 'Castle of Gwrtheyrnion' seems to have been used in the legendary accounts of Vortigern (see Robert Vermatt's Vortigern Studies) Although this reference from the Brut y Tywysogion seems to be distinct from those accounts.

- Philip Davis

Not scheduled

Not Listed

County Historic Environment Record
OS Map Grid Reference

No photos available. If you can provide pictures please contact Castlefacts

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  • King, D.J.C., 1983, Castellarium Anglicanum (London: Kraus) Vol. 2 p. 412


  • 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

Primary Sources

  • Brut y Tywysogion c. 1202 (Several transcriptions and translations exist the best being Jones, T., 1952, Brut Y Twysogion (University of Wales, History and Law series 11)–based on the Peniarth MS 20 version. There is a flawed translation Williams ab Ithel, John, 1860, Brut Y Twysogion or The Chronicle of the Princes (Rolls Series) online copy)