Duke of Somerset years after losing his position as Lord Protector, his titles were forfeited and he was beheaded on 22 January 1552. He was replaced in the minority government of Edward VI by John Dudley, Duke of Northumberland, whose pragmatic style contrasted with Seymour's mixture of idealism and arrogance. In 1644 Charles I granted the earldom of Glamorgan to Edward Somerset (1613–1667). He was a descendant of Charles Somerset, the illegitimate son of Henry Beaufort, 3rd Duke of Somerset. In return for obtaining military help from Ireland he promised Edward the title of Duke of Somerset. Under the Commonwealth Edward was banished
John Seymour, 4th Duke of Somerset John Seymour, 4th Duke of Somerset John Seymour, 4th Duke of Somerset (before 1646 – 29 April 1675) was an English peer and MP. He was the only surviving son of William Seymour, 2nd Duke of Somerset and Lady Frances Devereux and entered Grays Inn in 1666. He succeeded his nephew as the 4th Duke of Somerset in 1671. In 1656 he married Sarah, daughter and co-heiress of Sir Edward Alston and widow of George Grimston. He was elected Member of Parliament for Marlborough in 1661. He died in 1675, childless, and was buried in Salisbury Cathedral. He was succeeded