Rhos Ddiarbed, Llandinam

Has been described as a Certain Timber Castle (Motte)

There are earthwork remains

NameRhos Ddiarbed, Llandinam
Alternative NamesThe Moat; Moat Lane
Historic CountryMontgomeryshire
Modern AuthorityPowys
1974 AuthorityPowys

Monumental motte and bailey castle, thought to have been erected before 1086 by Roger de Montgomery. From a ditched motte, c.60m in diameter and 13m high, two baileys extend northward, the first, c.60m by 50m, strongly banked and ditched, the second, c.190m by 100m, defined by slight banks and scarps, with traces of a ditch. Castle mentioned in 1162. (Coflein)

Earthwork built by Roger de Montgomery in the 1080s, possibly adapting an Iron Age site. An oval outer bailey with a motte (9m high) closing one end. The summit of the motte is 15m across, and the bailey extends to 55m. The ramparts still stand 4m high , and the ditches were probably water filled from the surrounding marshland. (Dan Mersey)

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 ReferenceSO046905
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Calculate Print


  • Morgan, Gerald, 2008, Castles in Wales: A Handbook (Talybont: Y Lolfa Cyf.) p. 246 (listed)
  • Salter, Mike, 2001, The Castles of Mid Wales (Malvern) p. 51
  • Pettifer, Adrian, 2000, Welsh Castles, A Guide by Counties (Boydell Press) p. 151-2
  • Higham, R. and Barker, P., 1992, Timber Castles (Batsford) p. 226-7
  • King, D.J.C., 1983, Castellarium Anglicanum (London: Kraus) Vol. 1 p. 297
  • Renn, D.F., 1973 (2 edn.), Norman Castles of Britain (London: John Baker) p. 228
  • Fisher, J. (ed), 1917 Tours in Wales (1804-1813) by Richard Fenton (Cambrian Archaeological Association) online copy
  • Armitage, Ella, 1912, The Early Norman Castles of the British Isles (London: John Murray) p. 265 online copy
  • RCAHMW, 1911, An inventory of the Ancient Monuments of Montgomeryshire (HMSO) p. 69-70 no. 336 online copy
  • Lewis, Samual, 1849, A Topographical Dictionary of Wales online copy


  • Spurgeon, C.J., 1977, ‘Moat Lane motte (Rhos Ddiarbed)’ 124th Annual Meeting in Aberystwyth, South Montgomery and North Radnor, 1977, CAA p. 21-2
  • Spurgeon, C.J., 1966, ‘The castles of Montgomeryshire’ Montgomeryshire Collections Vol. 59 p. 14-15 online copy
  • 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
  • Gardner, 1932, Archaeologia Cambrensis Vol. 87 p. 436-7
  • Clark, G.T., 1889, 'Contribution towards a complete list of moated mounds or burhs' The Archaeological Journal Vol. 46 p. 197-217 esp. 217 online copy
  • Clark, G.T., 1877, 'The moated mounds of the upper Severn' Montgomeryshire Collections Vol. 10 p. 344 online copy
  • Clark, G.T., 1875, 'Moated mounds' Archaeologia Cambrensis Vol. 30 p. 64-5 online copy
  • Hamer, E., 1868, 'Ancient Arwystli: Its earthworks and other ancient remains' Montgomeryshire Collections Vol. 1 p. 211-13 (probably reprint of Archaeologia Cambrensis article) online copy
  • Hamer, 1868, 'Ancient Arwystli' Archaeologia Cambrensis Vol. 23 p. 3-4 online copy

Primary Sources

  • Brut y Tywysogion 1162 (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)


  • Brassil, K., 1987, Upland Survey: Caersws-Llanbrynmair (CPAT report)