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.

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Quick Facts Duchess consort of Lancaster, Reign ...

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

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Constance was the daughter of King Peter and María de Padilla. Peter had secretly married María, but was forced to repudiate her. Their relationship endured throughout his subsequent marriages, however. Peter was killed in 1369 by his half-brother Henry II, who then ascended the throne. Constance remained outside Henry's control, besieged at Carmona, until 1371. On 21 September, at Roquefort, near Bordeaux, Guienne, she married the English prince John of Gaunt, 1st Duke of Lancaster. Constance's younger sister, Isabella, married John's younger brother Edmund of Langley, 1st Duke of York. John and Constance had a son, John (1374–1375), and a daughter, Catherine.^[1][2]

A third son with no prospect of ascending the English throne, John intended to claim the throne of Castile in Constance's name. On 9 February 1372 Constance made a ceremonial entry into London as the queen of Castile, accompanied by John's eldest brother, Edward, the Black Prince, and an escort of English and Castilian retainers and London dignitaries. Crowds lined the streets to see her as she processed to the Savoy Palace in the Strand where she was ceremonially received by her husband, who had proclaimed himself king on 29 January.^[3]

John insisted that English nobles address him as "my lord of Spain", but was unsuccessful in his attempts to obtain the crown. His and Constance's daughter, Catherine, was married to Henry II's grandson, Henry III, thus uniting these two rival claims.

Constance was made a lady of the Garter in 1378.^[4] She died at Leicester Castle and was buried at the Church of the Annunciation of Our Lady of the Newarke, Leicester.^[5][6]