Charles Seymour, 6th Duke of Somerset the pride of birth and rank amounted almost to a disease". Charles was the second son of Charles Seymour, 2nd Baron Seymour of Trowbridge (died 1665), of Marlborough Castle in Wiltshire, by his wife Elizabeth Alington (1635–1692). The 2nd baron was (in a junior line) a great-great-grandson of Edward Seymour, 1st Duke of Somerset (executed 1552), brother of Queen Jane Seymour, uncle of King Edward VI and Lord Protector of England. Charles was educated at Harrow School and Trinity College, Cambridge, where his portrait by Nathaniel Dance-Holland survives in the College's collection. In 1675, Charles's elder brother Francis Seymour, 5th
Charles Seymour, 6th Duke of Somerset Duke of Somerset, aged 16, inherited the Dukedom of Somerset from their father's childless first cousin, John Seymour, 4th Duke of Somerset (1629–1675). However, the 5th Duke did not inherit the unentailed Seymour estates, including the family seat of Wulfhall and other Wiltshire estates, and much of the lands of the feudal barony of Hatch Beauchamp in Somerset, which were bequeathed to the 4th duke's niece, Elizabeth Seymour, wife of Thomas Bruce, 2nd Earl of Ailesbury (1656–1741). In 1660, following the Restoration of the Monarchy, the 4th duke's own father, a Royalist commander in the Civil War, had been restored