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- 1 Edward III of Winsor King of England, Lord of Ireland, Duke of Aquitane, Count of Ponthieu, Lord of Aquitane Plantagenet [1] b. 13 Nov 1312 d. 21 Jun 1377
Philippa DeHainault b. 24 Jun 1311 d. 15 Aug 1369
- 2 Lionel of Antwerp, Duke of Clarence [1.1]
b. 29 Nov 1338 d. 17 Oct 1368
- 2 John Gaunt Plantagenet [1.2]
b. 6 Mar 1340 d. 03 February 1399
Constance of Castile, Duchess of Lancaster
- 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
Katherine Swynford, Duchess of Lancaster b. 25 Nov 1350 d. 10 May 1403
Blanche of Lancaster b. 25 March 1345 d. 30 September 1369
- 2 Edmund of Langley, Plantagenet, 1st Duke of York [1.3]
b. 5 Jun 1341 d. 1 Aug 1402
- 2 Thomas of Woodstock, Duke of Gloucester [1.4]
b. 7 Jan 1355 d. Abt. 9 Sep 1397