William de Beauchamp, who m. Joan, dau. of Sir Thomas Walerie, and dying before the 13th (1211-12) of King John's reign, was s. by his son (a minor, whose wardship and marriage Roger de Mortimer and Isabel, his wife, obtained for 3,000 marks). [Sir Bernard Burke, Dormant and Extinct Peerages, Burke's Peerage, Ltd., London, 1883, p. 29-30, Beauchamp, Earls of Warwick]