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- 1 Constance of Castile, Duchess of Lancaster [1]
John Gaunt Plantagenet b. 6 Mar 1340 d. 03 February 1399
- 2 John de Beaufort, 1st Marquess of Somerset and 1st Marquess of Dorset, later only 1st Earl of Somerset, KG [1.1]
b. 1371 d. 16 March 1410
Margaret Holland, Duchess Of Clarence, Lady Companions of the Garter b. 1385 d. 31 Dec 1439
- 3 Henry de Beaufort, 2nd Earl of Somerset [1.1.1]
b. 26 Nov 1401 d. 25 Nov 1418
- 3 Joan Beaufort, Lady, Queen of Scots [1.1.2]
b. Abt. 1404 d. 15 Jul 1445
- 3 John de Beaufort, 1st Duke of Somerset, 3rd Earl of Somerset, KG [1.1.3]
b. 25 Mar 1404 d. 30 May 1444
- 3 Thomas de Beaufort, 1st Count of Perche [1.1.4]
b. Abt. 1405 d. 3 Oct 1431
- 3 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 [1.1.5]
b. 1406 d. 22 May 1455
- 3 Margaret de Beaufort, Countess of Devon [1.1.6]
b. Abt. 1409 d. 1449
- 2 Henry Beaufort [1.2]
b. 1374 d. 11 Apr 1447
- 2 Thomas de Beaufort [1.3]
b. January 1377 d. 27 December 1426