Castilian Civil War

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First Castilian Civil War
Part of the Hundred Years' War
Battle of Nájera, from a fifteenth-century manuscript, the English and Pedro are on the left while the French and Henry are on the right.
Date 1351–1369 Location Crown of Castile Result Victory for Henry of Trastámara
Belligerents
Pedristas Supported by: England Aquitaine Genoa Portugal Navarre Granada	Enriquistas Aragon France
Commanders and leaders
Peter of Castile Edward the Black Prince John of Gaunt James IV of Majorca	Henry of Trastámara Peter IV of Aragon

The First Castilian Civil War was a war of succession over the Crown of Castile that lasted from 1351 to 1369. The conflict started after the death of king Alfonso XI of Castile in March 1350. It became part of the larger conflict then raging between the Kingdom of England and the Kingdom of France: the Hundred Years' War. It was fought primarily in Castile and its coastal waters between the local and allied forces of the reigning king, Peter, and his illegitimate brother Henry of Trastámara over the right to the crown.