Probably first built as a ‘ringwork’ castle in 1108 by the Norman adventurer Gerald of Windsor, Cilgerran changed hands many times over the next century or more.
Mae’n siŵr mai castell ‘cylchfur’ a godwyd yma gyntaf ym 1108 gan yr anturiwr Normanaidd, Gerald de Windsor, ac yna newidiodd Cilgerran ddwylo lawer o weithiau dros y ganrif nesaf neu ragor.