Family: Thomas DE COURTENAY, 13th Earl of Devon / Margaret BEAUFORT, Countess of Devon (F36786)
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 | Hugh DE COURTENAY (1389-1422)
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| John BEAUFORT, 1st Earl of Somerset (1373-1410)
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| Henry BEAUFORT, 2nd Earl of Somerset (1401-1418) |
 | Lady Joan BEAUFORT, Queen of Scotland (1404-1445)  |
| John BEAUFORT, 1st Duke of Somerset (1404-1444) |
| Thomas BEAUFORT, Count of Perche (1405-1431) |
 | Edmund BEAUFORT, 2nd Duke of Somerset (1406-1455) |
| Thomas DE COURTENAY, 13th Earl of Devon (1414-1458)
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 | Margaret BEAUFORT, Countess of Devon (1409-1449)
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| Thomas COURTENAY, 14th Earl of Devon (1432-1461) |
| Sir John COURTENAY (1435-1471) |
| Joan COURTENAY (1447- ) |
| Elizabeth COURTENAY (1449- ) |