Family: John Beaufort, 1st Duke of Somerset, 3rd Earl of Somerset / Lady Margaret Beauchamp (F289)
 | 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) |
 | Lady Margaret Beauchamp (1410-1482) |
 | Lady Margaret Beaufort (1443-1509) |