He [Roger de St. John] probably married a niece of his guardian and stepfather, a sister of Hugh LE DESPENSER the Justiciar, who was son of Hugh LE DESPENSER and father of Hugh (LE DESPENSER), EARL OF WINCHESTER. He was slain at Evesham, 4 August 1265. [Complete Peerage XI:348, (transcribed by Dave Utzinger)]