Battle of Aljubarrota

Overview

The Battle of Aljubarrota was fought between the Kingdom of Portugal and the Crown of Castile on 14 August 1385. Forces commanded by King John I of Portugal and his Constable Nuno Álvares Pereira, with the support of English allies, opposed the army of King John I of Castile with its Aragonese and French allies, as well as Genoese mercenaries at São Jorge, between the towns of Leiria and Alcobaça, in central Portugal. The result was a decisive victory for the Portuguese, ruling out Castilian ambitions to the Portuguese throne, ending the 1383–85 Crisis and assuring John's position as King of Portugal.

Overview adapted from Wikipedia, licensed under CC BY-SA 4.0.

Significance

The Battle of Aljubarrota, fought on 14 August 1385 between the Kingdom of Portugal and the Crown of Castile at São Jorge in central Portugal, between Leiria and Alcobaça, produced a decisive Portuguese victory that settled the dynastic contest at the heart of the 1383–1385 Crisis. John I of Portugal, commanding alongside his Constable Nuno Álvares Pereira and English allies, defeated the substantially larger Castilian force of John I of Castile — supported by Aragonese, French, and Genoese contingents — inflicting casualties of 4,000–5,000 against Portuguese losses of roughly 1,000 from a force of 6,600 facing an army of 31,000. The scale of the disparity in losses underscores the completeness of the Castilian defeat. The outcome foreclosed Castilian claims to the Portuguese throne, ending the succession crisis that had destabilized Portugal since 1383 and securing John I's position as king. In doing so, Aljubarrota preserved Portuguese independence against absorption into the Castilian dynastic sphere, a result that defined the political configuration of the Iberian Peninsula for the period that followed.

Forces & casualties

Commanders (4)