Started in 1277 and largely completed by 1284, the castle is dominated by the great tower (or donjon) at its south-east corner.
Dechreuwyd y gwaith ym 1277 ac fe’i cwblhawyd gan mwyaf erbyn 1284, a phrif nodwedd y castell yw’r tŵr mawr (neu orthwr) yng nghornel y de-ddwyrain.