John Seymour, 4th Duke of Somerset and 3rd Marquess of Hertford was an English peer and MP.
- Occupation
- politician
- Position held
- Member of Parliament in the Parliament of England, Member of the 1661-79 Parliament, Lord Lieutenant of Wiltshire, Lord Lieutenant of Somerset
- Citizenship
- Kingdom of England
- Born
- 1646
- Died
- April 29, 1675