Katherine of Lancaster was born 6 June 1372 in Hertford Castle, Hertford, Hertfordshire, England, United Kingdom to John of Gaunt, 1st Duke of Lancaster (1340-1399) and Constance of Castile (1354-1394) and died 2 June 1418 in Valladolid, Spain of unspecified causes. She married Henry III of Castile (1379-1405) September 1388 JL in Palencia, Spain. Notable ancestors include Henry II of England (1133-1189), William I of England (1027-1087), Charlemagne (747-814), Hugh Capet (c940-996), Alfred the Great (849-899). Ancestors are from Belgium, the United Kingdom, Spain, France, Germany, Portugal, Russia, Ukraine, Hungary, the Netherlands, Italy, Turkey, the Byzantine Empire, the United States, Sweden.


Offspring of Henry III of Castile and Katherine of Lancaster (1372-1418)
Name Birth Death Joined with
Mary of Castile (1401-1458) 1401 1458 Alfonso V of Aragon (1396-1458)

Katherine of Castile (1403-1439)
John II of Castile (1405-1454) 6 March 1405 20 July 1454 Maria of Aragon (1396-1445)
Isabella of Portugal (c1428-1496)

Common ancestors of Katherine of Lancaster (1372-1418) and Henry III of Castile (1379-1405)

  1. Alfonso XI of Castile (1311-1350)
  2. Charles II of Naples (1254-1309)
  3. Constança of Portugal (1290-1313)
  4. Dinis of Portugal (1261-1325)
  5. Elizabeth of Aragon (1271-1336)
  6. Ferdinand III, King of Castile (1199-1252)
  7. Fernando IV of Castile (1285-1312)
  8. Maria of Hungary (c1257-1325)
  9. María de Molina (c1264-1321)
  10. Sancho IV of Castile (1258-1295)

second cousin

Footnotes (including sources)

‡ General