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- 1 John Gaunt Plantagenet, King of Castile and Leon [1] b. 14 March 1340 d. 3 Feb 1399
- Katherine DeRoet b. 25 Nov 1350 d. 10 May 1403
- 2 John de Beaufort [1.1] b. 1371 d. 16 March 1410
- Margaretha Holand b. 1380 d. 30 December 1439
- 3 Edmond Beauford, 1st Marquess of Dorset [1.1.1] b. 1406 d. 22 May 1455
- 3 Sir Lord Edmund I Plantagenet Beaufort, Knight of the Garter, Commander in the English Army, Justice in Eyre, 4th English Count of Mortain,, 4th Earl of Somerset, 1st Earl of Dorset, 1st Marquess of Dorset, 2nd Duke of Somerset, Lord Protector of England [1.1.2] b. 25 Mar 1406 d. 22 May 1455
- Lady Alianore "Eleanor" Beauchamp, Lady of Walthamstow, Baroness of Beauchamp, Baroness of Helmsley, Baroness of Ros, 1st Countess of Dorset,, 3rd Countess of Somerset, Countess of Mortain, 1st Marchioness of Dorset, 2nd Duchess of Somerset b. September 1408 d. 06 Mar 1467
- 3 Joan Beaufort, Queen Consort [1.1.3] b. 27 Dec 1407 d. 15 Jul 1445