John of Gaunt Plantagenet Duke of Lancaster & Constanza (Constance) Queen of Castile 
John of Gaunt and Constanza (Constance) were married in a religious ceremony on September 21st, 1371 in Roquefort, Guienne. They had a son and a daughter, named John and Katherine de Lancaster.
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Personal Details
John of Gaunt Plantagenet Duke of Lancaster
John of Gaunt was born on March 28th, 1340 in St. Bavon's Abbey, Ghent, Flanders, Netherlands. He died in Leicester Castle, London, England.
Constanza (Constance) Queen of Castile
Constanza (Constance) was born in 1354 in Castro Kerez, Spain. She died in Leicester Castle, England.
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Children
Katherine de Lancaster Plantagenet
Katherine de Lancaster was born in 1372. She died at the age of 46 on June 2nd, 1418 in Valladolid.
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