ROBERT ([1239]-1279 before 29 Apr, bur [Stafford, Priory of St Thomas]). The Annales Londonienses name "Robertum heredem suum generalem" as son of "Willelmum juniorem qui fuit comes de Ferrariis"[307]. He succeeded his father in 1254 as Earl of Derby. He rebelled against King Henry III in 1263, defeating the royal forces at Chester in Nov 1264. He was sent to the Tower but pardoned 5 Dec 1265 only to rebel again within a few months. He was captured at Chesterfield 15 May 1266 and kept in Windsor Castle for nearly three years, his lands and honours being forfeited[308]