Beginning as a castle of earth and wood in the early 12th century, it was quickly fortified in stone before being further strengthened with a curtain wall in the early 13th century.
A’r castell yn wreiddiol o bridd a phren tua dechrau’r 12fed ganrif, buan y cafodd ei atgyfnerthu â cherrig cyn cael ei gryfhau ymhellach â murlen tua dechrau’r 13eg ganrif.