War of the Castilian Succession

The Battle of Toro was fought on 1 March 1476 near the city of Toro during the War of the Castilian Succession, pitting the Castilian-Aragonese forces of the Catholic Monarchs — Ferdinand II of Aragon, Cardinal Mendoza, and the Duke of Alba — against the Portuguese-Castilian army of Afonso V of Portugal, Prince John of Portugal, and the Archbishop of Toledo. The two sides were closely matched in size, with the Portuguese-Castilian force numbering approximately 8,500 and the Castilian-Aragonese around 8,000. Portuguese casualties of 1,000 are recorded; no corresponding figure is given for the Castilian-Aragonese side. The engagement formed part of the broader dynastic contest over the Castilian succession, in which Afonso V pressed a rival claim to the Castilian throne through his betrothal to Juana la Beltraneja against the established position of Isabella I and Ferdinand II. The battle's outcome bearing on the trajectory of that contest — and the eventual consolidation of Isabella and Ferdinand's hold over Castile — places it among the defining military episodes of the succession conflict.

The Battle of Guinea was a naval engagement fought on the Gulf of Guinea in West Africa in 1478, between Portuguese and Castilian fleets, forming part of the wider War of the Castilian Succession. That conflict, fought between 1475 and 1479, set the Portuguese-backed claim of Afonso V against the Castilian crown against the rival claim supported by Ferdinand and Isabella of Castile and Aragon. The engagement on the Gulf of Guinea reflects the extent to which the war extended beyond the Iberian Peninsula into the Atlantic and African maritime theaters, where control of West African trade routes — particularly those connected to gold and later the slave trade — was a significant prize. Portuguese and Castilian interests had been in competition along the West African coast prior to the war, and the naval clash in these waters represented a direct contest over that commercial and strategic access. The outcome of the battle is not recorded, but the broader war concluded with the 1479 Treaty of Alcáçovas, which confirmed Portuguese dominance over West African waters and trade.