Blanche Plantagenet of Lancaster, Countess of Derby
- Born: 25 Mar 1345
- Marriage: John "of Gaunt" Plantagenet 1st. Duke of Lancaster on 13 May 1359 in Reading Abbey, BRK
- Died: 12 Sep 1369, Bolingbroke Castle, LIN aged 24
- Buried: St. Paul's Cathedral, LON
 Cause of her death was Bubonic Plague.
Blanche married John "of Gaunt" Plantagenet 1st. Duke of Lancaster, son of King Edward III Plantagenet of England and Phillippa of Hainault, on 13 May 1359 in Reading Abbey, BRK. (John "of Gaunt" Plantagenet 1st. Duke of Lancaster was born in Mar 1340 in St. Bavon's Abbey, Ghent, BELGIUM, died on 3 Feb 1399 in Leicester Castle, Leicester, LEI and was buried on 15 Mar 1399 in St. Paul's Cathedral, LON.)
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