Family: Thomas (5th Earl of Devon) Courtenay / Margaret (of Somerset) Beaufort (F39907)
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 | Hugh (4th Earl of Devon) De Courtenay (1389-1422)
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 | Anne Talbot ( -1440)
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| John (1st Earl of Somerset) Beaufort (1373-1410)
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| Margaret (of Kent) Holland (1383-1429)
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| John (1st Duke of Somerset) Beaufort (1404-1444)  |
| Henry (2nd Earl of Somerset) Beaufort (1401-1418) |
| Thomas (Earl of Perche) Beaufort (1405-1432) |
| Edmund (2nd Duke of Somerset) Beaufort (1406-1455) |
| Joan (of Somerset) Beaufort (1406-1445) |
| Thomas (5th Earl of Devon) Courtenay (1414-1458)
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| Thomas (6th Earl of Devon) Courtenay (1432-1461) |
| John (7Th Earl of Devon) Courtenay (1435-1471) |
| Henry Courtenay ( -1466) |