William de Valence, 1st Earl of Pembroke
ENGLISH EARL
William of Valence; Sir William de Valance; William de Valence; William de Valence, 1st Earl of Pembroke (3rd House); William de Valence, 1st Earl of Pembroke (3rd Creation)
William de Valence (died 13 June 1296), born Guillaume de Lusignan, was a French nobleman and knight who became important in English politics due to his relationship to King Henry III of England. He was heavily involved in the Second Barons' War, supporting the King and Prince Edward against the rebels led by Simon de Montfort.