Isabella of Castile, Duchess of York

For other people named Isabella of Castile, see Isabella of Castile (disambiguation).

Isabella of Castile
Duchess of York
Spouse	Edmund of Langley, 1st Duke of York
Issue
Edward of Norwich, 2nd Duke of York Constance of York Richard of Conisburgh, 3rd Earl of Cambridge
House	House of Burgundy (by birth) House of York (by marriage)
Father	Peter of Castile
Mother	María de Padilla
Born	c. 1355
Died	23 December 1392(1392-12-23) (aged c. 36–37)
Burial	14 January 1393 Kings Langley, Hertfordshire
Religion	Roman Catholicism

Infanta Isabella of Castile, Duchess of York (c. 1355 – 23 December 1392) was a daughter of King Peter of Castile and María de Padilla. She was a younger sister of Constance, Duchess of Lancaster.

In 1372, sometime between the 1 March and 30 April, Isabella married Edmund of Langley, 1st Duke of York, fourth son of Edward III of England and Philippa of Hainault at Wallingford. As a result of her marriage, she became the first of a total of eleven women who became (as a courtesy by marriage to their husbands) Duchess of York. They had three children:

• Edward of Norwich, 2nd Duke of York (1373 – 25 October 1415).
• Constance of York (1374 – 29 November 1416). Married Thomas le Despenser and was mother of Isabel le Despenser, Countess of Worcester and Warwick.
• Richard of Conisburgh, 3rd Earl of Cambridge (1375 – 5 August 1415).

She was named a Lady Companion of the Order of the Garter in 1378. Isabella died 23 December 1392 and on 14 January 1393 was buried in Kings Langley Manor House in Hertfordshire, England.