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The War of the Two Peters

War of the Two Peters
Date 1356 to 1375
Location Mostly towns in the Crown of Aragon; Kingdom of Valencia
Result Overthrowing of Peter I of Castile
Belligerents
Escudo de la Corona de Castilla.svg Crown of Castile
With the support of:
Royal Arms of England (1340-1367).svg Kingdom of England
CoA civ ITA milano.png Republic of Genoa
PortugueseFlag1248.svg Kingdom of Portugal
Blason Royaume Navarre.svg Kingdom of Navarre
COA of Nasrid dynasty kingdom of Grenade (1013-1492).svg Kingdom of Granada
Armas del soberano de Aragón.svg Crown of Aragon
With the support of:
Royal Coat of Arms of the Crown of Castile (15th Century).svg Henry of Trastámara
Blason France moderne.svg Kingdom of France
Commanders and leaders
Royal Coat of Arms of the Crown of Castile (15th Century).svg Peter of Castile
Arms of the Prince of Wales (Ancient).svg Edward, the Black Prince
Arms of John of Gaunt, 1st Duke of Lancaster.svg John of Gaunt, 1st Duke of Lancaster
Armas del soberano de Aragón.svgPeter IV of Aragon
Royal Coat of Arms of the Crown of Castile (15th Century).svg Henry of Trastámara

The War of the Two Peters (Spanish: La Guerra de los Dos Pedros, Catalan: Guerra dels dos Peres) was fought from 1356 to 1375 between the kingdoms of Castile and Aragon. Its name refers to the rulers of the countries, Peter of Castile and Peter IV of Aragon. One historian has written that "all of the centuries-old lessons of border fighting were used as two evenly matched opponents dueled across frontiers that could change hands with lightning speed."

At the beginning of the fourteenth century, Castile was suffering from unrest caused by its civil war, which was fought between the local and allied forces of the reigning king, Peter of Castile, and his half-brother Henry of Trastámara over the right to the crown.

Peter IV of Aragon supported Henry of Trastámara. Henry was, in turn, supported by the French commander Bertrand du Guesclin and his "free companies" of troops. Peter of Castile was supported by the English. The War of the Two Peters can thus be considered an extension of the wider Hundred Years' War as well as the Castilian Civil War.

Peter of Castile sought to claim the Kingdom of Valencia, which included parts of Murcia, Elche, Alicante, and Orihuela. Peter of Aragon wished to dominate the Mediterranean in opposition to Castile and Castile's ally Genoa.

A naval incident between the two powers had already caused tension: Catalan galleys, armed by Mossèn Francesc de Perellós, who had letters of marque from the Aragonese king, aided France against England, and also managed to capture two Genoese ships at Sanlúcar de Barrameda. Genoa was an ally of Castile. Peter of Castile, leading the Castilian fleet, caught up to Perellós at Tavira but was unable to capture him.


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