William de Braose, 1st Baron Braose

William de Braose, (alias Breuse, Brewes, Brehuse,Briouze, Brewose etc.; c. 1224–1291) was the first Baron Braose, as well as Lord of Gower and Lord of Bramber.

Braose was the son of John de Braose, the Lord of Bramber and Gower and John's wife Margaret, the daughter of Llywelyn the Great, prince of Gwynedd. These members of the Braose family were all descendants of William de Braose, who died around 1093 and was the Domesday tenant of Bramber. His family had its origins at Briouze in Normandy.

Braose's father was dead in 1232, before 18 July, when William became lord of his father's properties. William came of age before 15 July 1245, making his birth around 1224.

He served King Henry III of England and Henry's son Edward I as a councilor and in various councils. He sided with King Henry against Simon de Montfort during the civil war in England in the later part of Henry's reign. In April and May 1292, he was summoned to Parliament, as Lord Braose.

Braose was a benefactor of Sele Priory, with surviving charters recording the grant of a large estate in Crockhurst, Sussex to the priory in 1254. The charter was dated 4 January 1254, and was in exchange for 10 marks as an annual rent from the priory. Another charter records the gift of land near the road from Chichester to Bramber that was made at the urging of his mother Margaret. Other benefactions included gifs of rents and two small gifts of land. Around 1280, Braose released the priory from performing certain customary services and rents that it had previously paid to him and his ancestors.