| Male Thomas de Courtenay, 5th\13th Earl of Devon (3 May 1414 – 3 February 1458 |
| Birth | 3 May 1414 | |
| Death | 3 Feb 1458 | |
| Burial | ||
| Marriage | ||
| Father | ||
| Mother | ||
| Female Margaret de Beaufort, Countess of Devon |
| Birth | Abt. 1409 | |
| Death | 1449 | |
| Burial | ||
| Father | John de Beaufort, 1st Marquess of Somerset and 1st Marquess of Dorset, later only 1st Earl of Somerset, KG | F510 Group Sheet | |
| Mother | Margaret Holland, Duchess Of Clarence, Lady Companions of the Garter | F510 Group Sheet | |