(died 19 March 1309), who married Thomas de Berkeley, 1st Baron Berkeley of Berkeley Castle in Gloucestershire; Agnes de Ferrers, who married (1) Sir Robert de Musgrove, of Kemerton, Boddington & Deerhurst (2) John FitzReginald. Elizabeth de Ferrers, who married (1) William Marshal, killed at the Battle of Evesham in 1265 (2) Dafydd ap Gruffydd, a prince of Gwynedd. Death, burial & succession He died on 28 March 1254 and was buried in Merevale Abbey, Warwickshire. He was succeeded by his 15-year-old eldest son Robert de Ferrers, 6th Earl of Derby (1239–1279), still a minor, who in 1249 aged 10 had been married to Mary de Lusignan, a niece of King Henry III, and knighted. His wardship was granted to the King's eldest son, the future King Edward I. William's first wife's great estates in Ireland passed to her eldest daughter Agnes, and from Agnes to her son William de Vesci. References 5) Sanders, I.J. English Baronies: A Study of Their Origin and Descent, 1086-1327, 1960 Weis, Frederick. The Magna Carta Sureties, 1215, 1997 1193 births 1254 deaths Anglo-Normans People from Derbyshire People from Staffordshire 5