Isabella of Castile, Duchess of York
| Isabella of Castile | |
|---|---|
| Duchess of York | |
 |
|
| Born | 1355 |
| Died | 23 December 1392 |
| Burial | Kings Langley, Hertfordshire |
| Spouse | Edmund, 1st Duke of York |
| Issue |
Edward, 2nd Duke of York Constance of York Richard, 3rd Earl of Cambridge |
| House | House of Ivrea Burgundy |
| Father | Peter of Castile |
| Mother | María de Padilla |
Isabella of Castile, Duchess of York (1355 – 23 December 1392) was the daughter of King Peter and his mistress María de Padilla (d. 1361). She accompanied her elder sister, Constance, to England after Constance's marriage to John of Gaunt, 1st Duke of Lancaster, and married Gaunt's younger brother, Edmund of Langley, 1st Duke of York.
Isabella was the youngest of the three daughters of King Peter of Castile by his favourite mistress, María de Padilla (d.1361).
On 21 September 1371 Edward III's fourth son, John of Gaunt, 1st Duke of Lancaster, married Isabella's elder sister, Constance (d. 1394), who after the death of their father in 1369 claimed the throne of Castile. Isabella accompanied her sister to England, and on 11 July 1372, at about the age of 17, married John of Gaunt's younger brother, Edmund of Langley, 1st Duke of York, fifth son of King Edward III and Philippa of Hainault, at Wallingford, Oxfordshire, as part of a dynastic alliance in furtherance of the Plantagenet claim to the crown of Castile. According to Pugh, Isabella and Edmund of Langley were 'an ill-matched pair'.
As a result of her indiscretions, including an affair with King Richard II's half-brother, John Holland, 1st Duke of Exeter (d. 1400), whom Pugh terms 'violent and lawless', Isabella left behind a tarnished reputation, her loose morals being noted by the chronicler Thomas Walsingham. According to Pugh, the possibility that Holland was the father of Isabella's favourite son, Richard of Conisburgh, 3rd Earl of Cambridge, 'cannot be ignored'.
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