Constance of Castile, Duchess of Lancaster

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Constance of Castile
Detail from Froissart's Chronicles, depicting Constance at the surrender of Santiago de Compostela to her husband
Duchess consort of Lancaster
Reign	1371–1394
Duchess consort of Aquitaine
Reign	c. 1390 – 24 March 1394
Born	1354 Castrojeriz, Castile
Died	24 March 1394 (aged 39–40) Leicester Castle, Leicestershire, Kingdom of England
Burial	Church of the Annunciation of Our Lady of the Newarke, Leicester
Spouse	John of Gaunt, 1st Duke of Lancaster
Issue	Catherine, Queen of Castile
House	Castilian House of Ivrea
Father	Peter of Castile
Mother	María de Padilla

Constance of Castile (1354 – 24 March 1394) was a claimant to the Crown of Castile. She was the daughter of King Peter, who was deposed and killed by his half-brother, King Henry II. She married the English prince John of Gaunt, who fought to obtain the throne of Castile in her name, but ultimately failed.