Family: 1st Duke of Lancaster John of Gaunt Plantagenet / Constance de Castilla (F4660)
m. 21 Sep 1371
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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 21 Sep 1371 Bordeaux, Gironde, Aquitaine, France Other Spouse Blanche of Lancaster | F4661 Marriage 1359 Other Spouse Duchess of Lancaster Katherine Swynford de Roet | F4652 Marriage 13 Jan 1396 Father King of England Edward III of Windsor Plantagenet | F4653 Group Sheet Mother Philippa d'Avesnes | F4653 Group Sheet
Female
Constance de Castilla
Birth 1354 Castro, Asturias, Asturias, Spain Death 24 Mar 1394 Leicester, Leicestershire, England Burial Leicester, Leicestershire, England Father Pedro de Castilla, I | F4659 Group Sheet Mother Maria Juana de Padilla | F4659 Group Sheet
Female
Catherine of Lancaster
Birth 1372 Death 2 Jun 1418 Valladolid, Valladolid, Castilla-Leon, Spain Burial Spouse Henry de Castilla, III | F4886 Marriage