William Seymour, 3rd Duke of Somerset (17 April 165212 December 1671) was the son of

Henry Seymour, Lord Beauchamp Henry Seymour, Lord Beauchamp (c. 1626 – 14 March 1654) was an English nobleman, third son of William Seymour, 2nd Duke of Somerset.''The Complete Peerage'', vol. 12, 1953, "Somerset", p. 74. He had two elder brothers, but they both died unmarr ...

, and Mary Capell. As both his father and two elder uncles had predeceased him, he succeeded to the dukedom on the death of his grandfather William Seymour. He died in 1671, unmarried and childless and was succeeded by his paternal uncle John Seymour.

References

1652 births 1671 deaths 503 William Seymour, 03rd Duke of Somerset Marquesses of Hertford (1641 creation) {{England-duke-stub