Family History Research in Spain
- 1403
 | John Beaufort, 1st Earl of Somerset  1373-1410 |
| John Beaufort, 1st Earl of Somerset | |
| B: | 1372-1373 |
| D: | 16 Mar 1410 |
| Henry Beaufort 1375-1440 |
| Henry Beaufort | |
| B: | Abt. 1375 |
| D: | 13 Nov 1440 |
| Joan Beaufort 1377-1440 |
| Joan Beaufort | |
| B: | Abt. 1377 |
| D: | 13 Nov 1440 |
| Thomas Beaufort, 1st Earl of Dorset 1381-1426 |
| Thomas Beaufort, 1st Earl of Dorset | |
| B: | Abt. Jan 1381 |
| D: | 27 Dec 1426 |
| Katherine Swynford -1403 |
| Katherine Swynford | |
| D: | 10 May 1403 |
 | John of Gaunt, Duke of Lancaster 1340-1399 |
| John of Gaunt, Duke of Lancaster | |
| B: | 6 Mar 1340 |
| M: | 1396 |
| D: | 3 Feb 1399 |
| Leicester Castle, Leicestershire, England | |
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