Family: John of Gaunt, 1st Duke of Lancaster / Katherine de Roet Swynford, Duchess of Lancaster (F203)
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Male
John of Gaunt, 1st Duke of Lancaster
Birth 6 Mar 1340 Belgium 
Death 3 Feb 1399 Leicester Castle, Leicestershire, England Burial Marriage Other Spouse Blanche of Lancaster, Duchess of Lancaster | F489 Marriage Father Edward III, King of England | F662 Group Sheet Mother Philippa of Hainault, Queen consort of England | F662 Group Sheet
Female
Katherine de Roet Swynford, Duchess of Lancaster
Birth 25 Nov 1350 Death 10 May 1403 Burial Father Mother
Male
John Beaufort, 1st Earl of Somerset
Birth 1373 Anjeux, Haute-Saône, Franche-Comté, France Death 16 Mar 1410 St Catherine, England Burial Spouse Margaret Holland, Duchess of Clarence | F1156 Marriage
Female
Lady Joan Beaufort, Countess of Westmoreland
Birth c. 1379 Anjou, France Death 13 Nov 1440 Yorkshire, England Burial Spouse Ralph Neville, Earl of Westmoreland | F258 Marriage