Lady Elizabeth Seymour was born 26 November 1716 to Algernon Seymour, 7th Duke of Somerset (1684-1750) and Frances Thynne (1699-1754) and died 5 December 1776 of unspecified causes. She married Hugh Percy, 1st Duke of Northumberland (1715-1786) 16 January 1740 .
Children
| Name | Birth | Death | Joined with |
| Hugh Percy, 2nd Duke of Northumberland (1742-1817) | |||
| Algernon Percy, 1st Earl of Beverley (1750-1830) | 21 January 1750 London, England, United Kingdom | 21 October 1830 Le Mans, Sarthe, Pays de la Loire, France | Isabella Susannah Burrell (1750-1812) |
| Elizabeth Anne Frances Percy (-1761) | |||
Siblings
| Name | Birth | Death | Joined with |
| George Seymour (1725-1744) | |||
| Elizabeth Seymour (1716-1776) | 26 November 1716 | 5 December 1776 | Hugh Percy, 1st Duke of Northumberland (1715-1786) |