Isabella of Castile, Duchess of York
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Isabella of Castile, Duchess of York (c. 1355 – December 23, 1392) was a daughter of King Pedro of Castile and María de Padilla. She was a younger sister of Constance of Castille.
In 1372, Isabella married Edmund of Langley, 1st Duke of York, fourth son of Edward III of England and Philippa of Hainault. 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. On 14 January 1393 she was buried in Kings Langley Manor House in Hertfordshire, England.