War of the Two Pedros

War of the Two Peters
	Part of the First Castilian Civil War
Date	1356–1369
Location	Mostly towns in the Kingdom of Aragon and the Kingdom of Valencia, coast of the Principality of Catalonia
Result	Trastamarian victory Overthrow of Peter of Castile; Accession of Henry II of Castile;
Belligerents
Pedristas; Supported by:; England; Republic of Genoa; Portugal; Navarre; Granada	Aragon; Enriquistas; Supported by:; France
Commanders and leaders
Peter of Castile; Edward the Black Prince; John of Gaunt;	Peter IV of Aragon; Henry of Trastámara;

The War of the Two Peters (Spanish: La Guerra de los Dos Pedros, Catalan: Guerra dels dos Peres), also known as the Castilian–Aragonese War of 1356–1369, was fought from 1356 to 1369 between the crowns of Castile and Aragon. The conflict was a struggle between two claimants to the throne of Castile, Peter of Castile and Peter IV of Aragon. The former Peter was supported by England and several English nobles led by Edward III and his son, while the latter Peter was supported by France. The conflict also brought in the involvement of the kingdoms of Navarre and Portugal. The war resulted in Aragon gaining the upper hand, but it also devastated its economy that was already reeling from the effects of the Black Death.