The Battle of Aljubarrota secured Portuguese independence, ended the 1383–85 Crisis, and established the House of Aviz dynasty.
Key Facts
- Date
- 14 August 1385
- Result
- Decisive Portuguese victory
- Portuguese commander
- King John I of Portugal
- Constable
- Nuno Álvares Pereira
- Opposing side
- Kingdom of Castile with Aragonese, French, and Genoese allies
- Dynasty established
- House of Aviz
Location
Cause → Event → Consequence
The 1383–85 Crisis arose from a disputed succession to the Portuguese throne, with King John I of Castile pressing his claim and threatening to absorb Portugal into Castile. This prompted John of Aviz, supported by Portuguese nobles and English allies, to assert a rival claim and mobilize for war.
On 14 August 1385, Portuguese forces under King John I and Constable Nuno Álvares Pereira, aided by English troops, engaged and defeated the larger Castilian army—which included Aragonese, French, and Genoese contingents—at São Jorge in central Portugal, achieving a swift and decisive outcome.
The victory ended Castilian ambitions to the Portuguese throne and concluded the 1383–85 Crisis, securing Portuguese independence. The House of Aviz was firmly established as the ruling dynasty, and while minor border skirmishes with Castile continued until John I of Castile's death in 1390, they posed no serious threat.
Belligerents & Mobilization Analysis
Side A
2 belligerents
John I of Portugal, Nuno Álvares Pereira.
Side B
2 belligerents
John I of Castile.