William de Braose (c. 1197 â 2 May 1230) was the son of Reginald de Braose by his first wife, Grecia Briwere. He was an ill-fated member of the House of Braose, a powerful and long-lived dynasty of Marcher Lords.
William de Braose was born in Brecon, probably between 1197 and 1204. The Welsh, who detested him and his family name, called him Gwilym Ddu, Black William. He succeeded his father in his various lordships in 1227, including Abergavenny and Buellt.
William was captured by the Welsh forces of Prince Llywelyn the Great, in fighting in the commote of Ceri near Montgomery, in 1228. As part of the price of his ransom, William agreed to marry his daughter Isabella de Braose to Llywelyn's only legitimate son Dafydd ap Llywelyn. However, while in captivity William had an affair with Llywelyn's wife, Joan, Lady of Wales. Invited by Llywelyn to the Easter festivities in 1230, William renewed the liaison with Joan and was caught in flagrante with her. Llywelyn had him hanged on 2 May 1230.
William married Eva Marshal, daughter of William Marshal, 1st Earl of Pembroke. They had four daughters:
With William's death by hanging and his having four daughters, who divided the de Braose inheritance between them and no male heir, the titles now passed to the junior branch of the de Braose dynasty, and the only male heir was now John de Braose who had already inherited the titles of Gower and Bramber from his far-sighted uncle Reginald de Braose.