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
Berkeley, Gloucestershire 824 as "Berclea", from the Old English for "birch lea". Berkeley was a significant place in medieval times. It was a port and market-town, and the meeting place of the hundred of Berkeley. After the Norman Conquest, a Flemish noble named Roger de Tosny was appointed Provost of the manor of Berkeley by his brother-in-law (or perhaps uncle) Earl William FitzOsbern. His family took the name "de Berkeley", and it was he who began the construction of Berkeley Castle, which was completed by his son, also Roger. A younger son of the elder Roger, John de Berkeley, went north to