This Norman castle was built at the beginning of the thirteenth century. The castle has swopped hands on a number of occasions and Llewellyn the Great sacked it in 1231. It also came under a failed attack at the time of Owain Glynd?r's rising. It fell into disuse in the sixteenth century and the remains today include a tower, gateway and walls. It is located southeast of Builth Wells in the centre of Hay-on-Wye (Y Gelli Gandryll) on the B4350.