Ceredigion, west Wales
aka Castell Cadwaladr or Llanrhystyd

OS 135 SN 552695 R4
Caer Penrhos is a superbly-sited, magnificent ringwork castle, apparently built within an earlier Iron Age hillfort, which has been used as a bailey. The castle was built in 1149, some say by Cadwaladr, son of Gruffydd ap Cynan. The earthworks are well preserved on this site of considerable strength.
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