He was a younger son of William III de Beauchamp (c.1215-1269) of Elmley Castle in Worcestershire, hereditary Sheriff of Worcestershire, by his wife Isabel de Mauduit, daughter of William de Mauduit of Hanslope in Buckinghamshire and Hartley Mauditt, Hampshire (by his wife Alice de Beaumont (d. pre- 1263), half-sister of Henry de Beaumont, 5th Earl of Warwick (c.1192-1229)) and sister and heiress of William Mauduit, 8th Earl of Warwick).