 It was built in about the 1220s by one of the princes of the kingdom of Deheubarth, and changed hands several times in the struggles between the Welsh and English over the ensuing centuries.It is considered one of the most important remaining structures built by a Welsh chieftain and is a Grade I listed building.Perched on the top of an isolated, rocky hill above the Towy Valley, Dryslwyn Castle occupies a splendid defensive position.