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
Edward Seymour, 1st Duke of Somerset his offices to delegates. Somerset faced less manageable opposition from his younger brother Thomas, who has been described as a "worm in the bud". As King Edward's uncle, Thomas Seymour demanded the governorship of the king's person and a greater share of power. Somerset tried to buy his brother off with a barony, an appointment to the Lord Admiralship, and a seat on the Privy Council—but Thomas was bent on scheming for power. He began smuggling pocket money to King Edward, telling him that Somerset held the purse strings too tight, making him a "beggarly king". He also urged him