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- 1 Maria de Padilla, (Mistress) [1] b. Abt. 1334 d. Jul 1361
The king of Castile and León from 1350 to 1369. Peter was the last ruler of the main branch of the House of Ivrea. Peter, King of Castile and León b. 30 Aug 1334 d. 23 Mar 1369
- 2 Isabella, of Castile, Duchess of York [1.1]
b. 1355 d. 23 Dec 1392
- 2 Constance of Castile, Duchess of Lancaster [1.2]
John Gaunt Plantagenet b. 6 Mar 1340 d. 03 February 1399
- 3 John de Beaufort, 1st Marquess of Somerset and 1st Marquess of Dorset, later only 1st Earl of Somerset, KG [1.2.1]
b. 1371 d. 16 March 1410
Margaret Holland, Duchess Of Clarence, Lady Companions of the Garter b. 1385 d. 31 Dec 1439
- 4 Henry de Beaufort, 2nd Earl of Somerset [1.2.1.1]
b. 26 Nov 1401 d. 25 Nov 1418
- 4 Joan Beaufort, Lady, Queen of Scots [1.2.1.2]
b. Abt. 1404 d. 15 Jul 1445
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- 4 John de Beaufort, 1st Duke of Somerset, 3rd Earl of Somerset, KG [1.2.1.3]
b. 25 Mar 1404 d. 30 May 1444
- 4 Thomas de Beaufort, 1st Count of Perche [1.2.1.4]
b. Abt. 1405 d. 3 Oct 1431
- 4 Edmund de Beaufort, 2nd Duke of Somerset, 4th Earl of Somerset, 1st Earl of Dorset, 1st Marquess of Dorset styled 1st Count of Mortain,KG [1.2.1.5]
b. 1406 d. 22 May 1455
- 4 Margaret de Beaufort, Countess of Devon [1.2.1.6]
b. Abt. 1409 d. 1449
- 3 Henry Beaufort [1.2.2]
b. 1374 d. 11 Apr 1447
- 3 Thomas de Beaufort [1.2.3]
b. January 1377 d. 27 December 1426