Castile–Aragon Succession Rivalry and Iberian Confrontation

Name: Castile–Aragon Succession Rivalry and Iberian Confrontation
Start: 1431
End: 1440

Type Event Region Europe Time 1431–1440

In the 1430s, Castile's John II and Aragon's Alfonso V clashed over the Navarrese succession, the Neapolitan throne, and internal Iberian factional i…

Timeline

1431–1435Navarre · NavarreCastile and Aragon engaged in diplomatic and military maneuvering over the Navarrese succession and control of the Pyrenean frontier, each backing different royal candidates and local noble factions, keeping the northeast of the peninsula in sustained tension.
1435–1440Barcelona · CataloniaAlfonso V campaigned for years in Italy, leaving Aragon and Catalonia governed by regents and cortes, while Castile seized the opportunity to strengthen alliances with frontier nobles. Their rivalry over Naples spilled into factional conflict within the peninsula, undermining prospects for joint Reconquista efforts.

Sources

Iberian Union — Castile and Aragon in the 15th century https://en.wikipedia.org/wiki/History_of_Spain