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 Newhailes. The castle stands on a promontory on the Scottish River Tyne, blocking its strategic route, and preying on the route to Edinburgh. Within the 13th century curtain wall is the 14th century keep, to which ranges were added in the next two centuries. The major remaining works is the West Tower, a square donjon, which dwarfs the remains of the central tower that the Gourlays built, probably a rebuilding on the 16th century. Fifteenth century work includes a roofless chamber in which the remains of what appear to be an ambry and a piscina suggest it was a chapel