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 groom of the stool. Catherine gave birth to her daughter, Lady Mary Seymour, on 30 August 1548, only to die on 5 September of that year. She was buried in the Chapel. Her grave was later discovered in 1782, after the castle and the chapel had been left in ruins by the English Civil War. She was later reinterred by the Rector of Sudeley in 1817, and an elaborate tomb was erected in her honour. In 1549, Lord Seymour's ambitions led him to be arrested and beheaded; after which, Sudeley Castle became the property of Catherine's brother, William Parr, 1st