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
Sudeley Castle War. He built quarters for servants and men at arms on the double courtyard that was surrounded by a moat. He also added state and family apartments on the second courtyard. The Chapel, which would become St. Mary's, and the tithe barn were also built under Boteler. Unfortunately, Boteler failed to gain royal permission to crenellate the castle, and had to seek King Henry VI's pardon. Due to his support for the Lancastrian cause, King Edward IV of England confiscated the castle from Boteler in 1469, and gave it to his brother, Richard Plantagenet, Duke of Gloucester, who later became