Dryslwyn Castle is a native Welsh castle, much of which has been revealed by excavation. It was occupied by the Princes of Deheubarth and was taken by the forces of King Edward I in 1287. It was seized by Owain Glyndŵr in 1403. The castle of limestone walls, was built in the 1220s, and appears to have been demolished in the early 15th Century. The polygonal inner ward contains principal remains to the south west, with traces of middle and outer wards to the north east. The early 13th Century curtain wall to the inner ward only stands 1m high. There is a garderobe to the east side, and a remodelled 13th Century gatehouse to the north east, surviving at foundation level only. On the south side of gatehouse is the round tower, the original keep. The foundations of the original great hall and Maredudd ap Rhys' hall survive.