 In 1247, William, along with two of his brothers, moved from France to England, where their half-brother, Henry III was King.The King married William to Joan de Munchensi (d. 1307), a granddaughter and heiress to the great William Marshal, 1st Earl of Pembroke.Valence was granted custody of the lands, and the title of Earl of Pembroke, giving him great wealth and power in his new land.