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 Castle received a royal charter from King Henry II giving him permission to rebuild the castle. Fitzharding built the circular shell keep during 1153–56, probably on the site of the former motte. The building of the curtain wall followed, probably during 1160–90 by Robert and then by his son Maurice. Much of the rest of the castle is 14th century and was built for Thomas de Berkeley, 3rd Baron Berkeley: Thorpe's Tower, to the north of the keep, the inner gatehouse to its southwest, and other buildings of the inner bailey. The castle was ransacked in 1326 by the forces of