Isabella Bennet FitzRoy, Duchess of Grafton
1668 - 1723 (55 years)
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 | Vice-Admiral Lord Hugh Seymour 1759-1801 |
| Vice-Admiral Lord Hugh Seymour | |
| B: | 29 Apr 1759 |
| London, England | |
| D: | 11 Sep 1801 |
| HMS Tisiphone, off Jamaica | |
| Lady Anne Horatia Waldegrave 1762-1801 |
| Lady Anne Horatia Waldegrave | |
| B: | 1762 |
| D: | 12 Jun 1801 |
| Lady Isabella Fitzroy, Countess of Hertford | |
| B: | 1726 |
| D: | 10 Nov 1782 |
| Francis Seymour-Conway, 1st Marquess of Hertford | |
| B: | 5 Jul 1718 |
| Chelsea, London, England | |
| M: | 29 May 1741 |
| D: | 14 Jun 1794 |
| Surrey, England | |
| Charles FitzRoy, 2nd Duke of Grafton 1683-1757 |
| Charles FitzRoy, 2nd Duke of Grafton | |
| B: | 25 Oct 1683 |
| D: | 6 May 1757 |
| Lady Henrietta Somerset 1690-1726 |
| Lady Henrietta Somerset | |
| B: | 27 Aug 1690 |
| D: | 9 Aug 1726 |
| Isabella Bennet FitzRoy, Duchess of Grafton | |
| B: | 1668 |
| D: | 7 Feb 1723 |
| Henry FitzRoy, 1st Duke of Grafton 1663-1690 |
| Henry FitzRoy, 1st Duke of Grafton | |
| B: | 28 Sep 1663 |
| D: | 9 Oct 1690 |