Built by Welsh ruler Llywelyn ap Iorwerth (Llywelyn the Great) to protect Gwynedd’s southern frontier, construction began in 1221 with the castle remaining in use until 1294.
Fe’i hadeiladwyd gan reolwr Cymru Llywelyn ap Iorwerth (Llywelyn Fawr) i warchod ffin ddeheuol Gwynedd, a dechreuodd y gwaith adeiladu ym 1221, a’r castell yn cael ei ddefnyddio o hyd tan 1294.