John Seymour, 4th Duke of Somerset

John Seymour, 4th Duke of Somerset and 3rd Marquess of Hertford (before 1646  29 April 1675) was an English peer and MP.

His Grace
The Duke of Somerset
John Seymour, 4th Duke of Somerset
Duke of Somerset
PredecessorWilliam Seymour
SuccessorFrancis Seymour
Titles and styles
BornJohn Seymour
born 1646
Died(1675-04-29)29 April 1675
Sarah Alston (m. 1656)
FatherWilliam Seymour
MotherFrances Devereux

He was the only surviving son of William Seymour, 2nd Duke of Somerset, and Lady Frances Devereux, and he entered Gray's 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.[1]

He was elected Member of Parliament for Marlborough in 1661.

He died in 1675, childless, and was buried in Salisbury Cathedral. He was succeeded in the dukedom by his cousin, Francis Seymour. The Marquessate of Hertford became extinct on his death.[2]



  1. "History of Parliament". History of Parliament Trust. Retrieved 29 October 2011.
  2. Chisholm, Hugh, ed. (1911). "Somerset, Earls and Dukes of" . Encyclopædia Britannica. 25 (11th ed.). Cambridge University Press. p. 385.
Honorary titles
Preceded by
The Duke of Ormonde
Lord Lieutenant of Somerset
Succeeded by
The Earl of Winchilsea
Preceded by
The Marquess of Worcester
Custos Rotulorum of Somerset
Succeeded by
The Viscount Fitzhardinge
Preceded by
The Earl of Essex
Lord Lieutenant of Wiltshire
Succeeded by
The 7th Earl of Pembroke
Preceded by
The 6th Earl of Pembroke
Custos Rotulorum of Wiltshire
Peerage of England
Preceded by
William Seymour
Duke of Somerset
Succeeded by
Francis Seymour

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