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- BIOGRAPHY: WILLIAM DE WARENNE, son and heir apparent. In 1276 he agreed that his father might at his death dispose of the Earl's lands in Norfolk. In 1285 he was knighted at Winchester; and in the same year obtained quittance from the common summons in Essex, Bucks and Norfolk. He married, probably in June 1285, Joan, daughter of Robert (DE VERE), 5th EARL OF OXFORD, by Alice, daughter and heir of Gilbert DE SANFORD. He died v.p. 15 December 1286, having attended a tournament at Croydon, where he is said to have been ambushed and cruelly slain by his rivals. His widow died on or before 23 November 1293, and was buried before the high altar at Lewes. [Complete Peerage XII/1:507
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Abt 1260 - 1286 (~ 26 years)
