Marquess of Hertford (1641)

==Holders==
 	From 	Until 	Name 	Lifespan
1.	3 June 1641 	24 October 1660 	The Most Noble William Seymour, 2nd Duke of Somerset, K.G., P.C.	1587-1660
2.	24 October 1660 	12 December 1671	The Most Noble William Seymour, 3rd Duke of Somerset 	1652-1671
3.	12 December 1671	29 April 1675 	The Most Noble John Seymour, 4th Duke of Somerset 	1628-1675
==Other Titles==
===Peerage of England===
*Duke of Somerset (1547), 1660-1675
*Earl of Hertford (1559), 1641-1675
*Baron Seymour (1547), 1641-1675
*Baron Beauchamp (1559), 1641-1675