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
Hailes Castle truces with England in 1449, 1451-7 and 1459. It is thought that Sir Patrick Hepburn dramatically extended the castle. A massive tower of at least four storeys was built to the west of the original construction, and a lower tower to the East to form a long north range, looming above the River Tyne. The thick curtain wall of the castle may date back to the 13th century. In 1400 it successfully withstood an attack from Harry Hotspur Percy, in league with the Earl of March. The attackers were defeated afterwards in a counter-attack led by Archibald, Master of Douglas.