The Duke of Somerset | |
|---|---|
 John Seymour, 4th Duke of Somerset | |
| Duke of Somerset | |
| Tenure | 1671–1675 |
| Predecessor | William Seymour |
| Successor | Francis Seymour |
| Born | John Seymour born 1646 |
| Died | 29 April 1675 |
| Spouse(s) |
Sarah Alston (m. 1656) |
| Father | William Seymour |
| Mother | Frances Devereux |
John Seymour, 4th Duke of Somerset and 3rd Marquess of Hertford (before 1646 – 29 April 1675) was an English peer and MP.