William Seymour, 2nd Duke of Somerset was the great-grandson of Edward Seymour, 1st Duke of Somerset (c.1500-1552), the uncle of King Edward VI and Lord Protector of England. Seymour made a secret marriage at Greenwich on 22 June 1610 to Arbella Stuart (d.1615), daughter of Charles Stuart, 1st Earl of Lennox and Elizabeth Cavendish. Arbella was thirteen years his senior, and King James I disapproved of the marriage as the union of two potential Tudor pretenders to the throne, who were respectively fourth and sixth in line, could only be seen as a threat to the ruling dynasty. As a result, William was condemned to life
Charles Seymour, 6th Duke of Somerset in 1750. He was created Baron Warkworth of Warkworth Castle and Earl of Northumberland, both with special remainder to Smithson; and was created at the same time Baron Cockermouth and Earl of Egremont, with special remainder to Wyndham. (It has always been customary on the creation of a greater peerage title to create at the same time a barony, to be used as a courtesy title for the eldest son). Charles Seymour, 6th Duke of Somerset Charles Seymour, 6th Duke of Somerset (13 August 1662 – 2 December 1748), known by the epithet "The Proud Duke", was a British peer.