John Fitz-Alan, 6th Earl of Arundel, m. Isabel, dau. of Sir Roger Mortimer (which lady m. 2ndly, Ralph de Arderne, and 3rdly, Robert de Hastings), and dying 1269, was s. by his son, Richard Fitz-Alan, 7th Earl of Arundel. [Sir Bernard Burke, Dormant, Abeyant, Forfeited, and Extinct Peerages, Burke's Peerage, Ltd., London, 1883, p. 200, Fitz-Alan, Earls of Arundel, Barons Maltravers]