Maurice de Berkeley m. in 1240, Isabel, dau. of Maurice de Credonia, by his wife, Isabel, sister of William de Valence, Earl of Pembroke, d. 4 April, 1281, and was s. by his 2nd son, the eldest, Maurice, having been killed in a tournament at Kenilworth. [Sir Bernard Burke, Dormant, Abeyant, Forfeited, and Extinct Peerages, Burke's Peerage, Ltd., London, 1883, p. 44, Berkeley, Viscount Berkeley, Earl of Nottingham, and Marquess of Berkeley]