Family: John Beaufort, 1st Earl of Somerset / Margaret Holland, Duchess of Clarence (F1156)
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 | John of Gaunt, 1st Duke of Lancaster (1340-1399)
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 | Katherine de Roet Swynford, Duchess of Lancaster (1350-1403) |
| Lady Joan Beaufort, Countess of Westmoreland (1379-1440)  |
| Thomas Holland, 2nd Earl of Kent (1350-1397)
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| Alice FitzAlan, Countess of Kent (1350-1416)
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| Alianore Holland, Countess of March (1370-1405) |
| John Beaufort, 1st Earl of Somerset (1373-1410)
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| Margaret Holland, Duchess of Clarence (1385-1439)
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| Joan Beaufort, Queen consort of Scots (1404-1445) |
| Edmund Beaufort, 2nd Duke of Somerset (1406-1455) |
| Margaret Beaufort, Countess of Devon (1409-1449) |