Battle of Aljubarrota

A decisive 1385 battle in which Portuguese forces defeated a larger Castilian army, securing Portugal’s independence during the 1383–1385 crisis.

Nuno Álvares Pereira: A Portuguese military commander who led forces in the 1383–1385 crisis and became a national hero. He commanded the Portuguese army and helped choose its defensive position.
1383–1385 Portuguese interregnum: A period of political crisis in Portugal after King Ferdinand I died without a male heir. The interregnum created the struggle for the crown that led to Aljubarrota.
John I of Portugal: The first king of Portugal from the House of Aviz, reigning from 1385 to 1433. His election and victory established the dynasty whose rule the battle secured.
Treaty of Windsor (1386): A 1386 alliance between Portugal and England, often regarded as the oldest continuing diplomatic alliance. The treaty formalized Portugal’s English partnership after its survival of Castilian intervention.
São Jorge de Aljubarrota: A Portuguese parish near the site of the 1385 battle. The battle takes its name from this locality.
English longbow: A powerful medieval bow used by English and allied armies for sustained missile fire. English archers in Portuguese service contributed to the defensive fire at Aljubarrota.
Ferdinand I of Portugal: King of Portugal from 1367 to 1383, whose death without a male heir triggered a succession crisis. His death opened the dynastic dispute behind the Castilian invasion.
Master of Aviz: The title held by John, an illegitimate son of Peter I of Portugal, before his election as king. As Master of Aviz, John became the central Portuguese claimant during the crisis.
House of Aviz: A Portuguese royal dynasty founded by John I, ruling from 1385 until 1580. The victory enabled the new dynasty to consolidate its rule.
Chapel of Saint George (Aljubarrota): A small chapel near the battlefield, associated with commemoration of the Portuguese victory. Local tradition ties this chapel to the battle’s remembrance.

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