Family: 1st Duke of Lancaster John of Gaunt Plantagenet / Duchess of Lancaster Katherine Swynford de Roet (F4652)
m. 13 Jan 1396
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Male
1st Duke of Lancaster John of Gaunt Plantagenet
Birth 24 Jun 1340 Gent, Oost-Vlaanderen, Belgium 
Death 4 Feb 1399 Leicestershire, England Burial 15 Mar 1398 London, London, England Marriage 13 Jan 1396 [1] Other Spouse Blanche of Lancaster | F4661 Marriage 1359 Other Spouse Constance de Castilla | F4660 Marriage 21 Sep 1371 Bordeaux, Gironde, Aquitaine, France Father King of England Edward III of Windsor Plantagenet | F4653 Group Sheet Mother Philippa d'Avesnes | F4653 Group Sheet
Female
Duchess of Lancaster Katherine Swynford de Roet
Birth 25 Nov 1350 Abbeville, Somme, Picardie, France Death 10 May 1403 Anjou, Isere, Rhone-Alpes, France Burial 1403 Lincoln, Lincolnshire, England Father Guilles Paon de Roet | F5351 Group Sheet Mother
Male
1st Earl of Somerset John Beaufort
Birth 1373 Lincolnshire, England Death 16 Mar 1410 London, England Burial 1410 Canterbury, Kent, England Spouse Margaret Holland | F5076 Marriage Bef 28 Sep 1397 Upholland, Lancashire, England
Male
Cardinal Henry Beaufort
Birth 1375 Montmorency, Calvados, Basse-Normandie, France Death 11 Apr 1447 Winchester, Hampshire, England Burial 1447 Winchester, Hampshire, England Spouse Alice Charleten Fitzalan | F5078 Marriage
Female
Lady Joan Beaufort
Birth 29 Jan 1375 Maine-et-Loire, Pays de la Loire, France Death 13 Nov 1440 Howden, Yorkshire, England Burial 1440 Lincoln, Lincolnshire, England Spouse Robert Ferrer | F5077 Marriage Bef 30 Sep 1390 Maine-et-Loire, Pays de la Loire, France Spouse 1st Earl of Westmoreland Ralph Neville | F3892 Marriage Bef 29 Nov 1396 Maine-et-Loire, Pays de la Loire, France
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Sources - [S660] Heritage Consulting, Millennium File, (Name: Ancestry.com Operations Inc; Location: Provo, UT, USA; Date: 2003;).
- [S660] Heritage Consulting, Millennium File, (Name: Ancestry.com Operations Inc; Location: Provo, UT, USA; Date: 2003;).