Duke John Plantagenet of Lancaster (1st)
- Born: 6 Mar 1340, Ghent
- Marriage (1): Countess Blanche Lancaster of Derby on 19 May 1359 in Reading Abbey, Reading, Berkshire, England
- Marriage (2): Constance
- Marriage (3): Katherine Roet
- Died: 3 Feb 1399 aged 58
- Buried: St. Paul's Cathedral, London, England
 Another name for John was John of Gaunt.
Noted events in his life were:
• Knighted: Knight of the Garter.
• Ruled: King of Castile and Leon.
John married Countess Blanche Lancaster of Derby, daughter of Duke Henry Plantagenet of Lancaster (1st) and Isabel Beaumont, on 19 May 1359 in Reading Abbey, Reading, Berkshire, England. (Countess Blanche Lancaster of Derby was born on 25 Mar 1345 in Bolingbroke Castle, Lincolnshire, died on 12 Sep 1369 in Bolingbroke Castle, Lincolnshire and was buried in St. Paul's Cathedral, London, England.)
John next married Constance. (Constance died in 1394.)
John next married Katherine Roet, daughter of Sir Payn Roet Guienne King of Arms and Unknown. (Katherine Roet died in 1403.)
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