Noted events in her life were:
• Alt. Birth: Heiress of Castile and Leon.
Constance married Duke John Plantagenet of Lancaster (1st), son of King Edward III Plantagenet of England and Philippa of Hainault and Holland. (Duke John Plantagenet of Lancaster (1st) was born on 6 Mar 1340 in Ghent, died on 3 Feb 1399 and was buried in St. Paul's Cathedral, London, England.)
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