Isabella of Castile , Duchess of York
- Born: Abt 1355, Castile
- Marriage: Edmund of Langley Plantagenet 1st Duke of York about 1 Mar 1372 in Hertford, Hertfordshire, England
- Died: 23 Nov 1393, Windsor Castle, Berkshire, England aged about 38
- Buried: King's Langley, Hertfordshire, England
Isabella married Edmund of Langley Plantagenet 1st Duke of York, son of Edward III Plantagenet , King of England and Philippa of Hainault, about 1 Mar 1372 in Hertford, Hertfordshire, England. (Edmund of Langley Plantagenet 1st Duke of York was born on 5 Jun 1341 in Abbot's Langley, Hertfordshire, England, died on 1 Aug 1402 in King's Langley, Hertfordshire, England and was buried in King's Langley, Hertfordshire, England.)
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