Constance of Castile was born 1354 in Castrojeriz, Spain to Pedro I of Castile (1334-1369) and Maria de Padilla (c1334-1361) and died 24 March 1394 Leicester Castle, Leicester, Leicestershire, England, United Kingdom of unspecified causes. She married John of Gaunt, 1st Duke of Lancaster (1340-1399) November 1371 JL in Roquefort, France. Alfred the Great (849-899)/s, Charlemagne (747-814)/s, Henry II of England (1133-1189)/s, Hugh Capet (c940-996)/s, William I of England (1027-1087)/s, Rollo of Normandy (860-932)/s.
|Offspring of Constance of Castile and John of Gaunt, 1st Duke of Lancaster (1340-1399)|
|Katherine of Lancaster (1372-1418)||6 June 1372 Hertford Castle, Hertford, Hertfordshire, England, United Kingdom||2 June 1418 Valladolid, Spain||Henry III of Castile (1379-1405)|
|John of Lancaster (1374-1374)|