Maurice de Berkeley 1243 and, on 14 December 1243, he had livery of his father's lands. He fought in the war in North Wales and in 1264 he joined the Barons against King Henry III. Berkeley died on 4 April 1281 and was buried in St Augustine's Abbey in Bristol. Maurice de Berkeley Sir Maurice de Berkeley "the Resolute" (1218 - 4 April 1281), 5th (feudal) Baron de Berkeley, was an English soldier and rebel, residing at Berkeley Castle in the English county of Gloucestershire. Maurice was born in 1218 to Thomas de Berkeley and Joan de Somery. He married Isabel FitzRoy, the
Thomas de Berkeley, 5th Baron Berkeley to that of his contemporary Sir Maurice Russell (d.1416) at Dyrham, who was the father-in-law of Gilbert Denys, one of Berkeley's feoffees. Having died without male progeny the succession to the vast Berkeley estates became disputed, and eventually resulted in the Battle of Nibley Green (1469/70), the last battle fought in England entirely between the private armies of feudal magnates, fought near Berkeley Castle on 20 March 1469/70 between the troops of Thomas Talbot, 2nd Viscount Lisle and William Berkeley, 2nd Baron Berkeley, later 1st Marquess of Berkeley. Lisle and William Berkeley had long been engaged in a dispute over