Britannica AI Icon

House of Trastámara

Spanish dynasty

Quick Summary

The House of Trastámara was a Spanish dynasty that ruled Castile and Aragon. It originated with Henry II of Castile (1369–79), who gained the throne after a conflict with his half-brother, Peter the Cruel.1

The dynasty's rule in Castile was marked by struggles between the monarchy and the nobility, as well as external threats from North Africa. Key rulers included John I, who attempted to claim Portugal, and Henry III, who asserted royal power. John II's reign saw significant influence from his royal favorite, Álvaro de Luna.1

The union of Castile and Aragon occurred when Ferdinand II of Aragon married Isabella I of Castile in 1469. This union, finalized in 1479, created a powerful monarchy in Europe. Their reign focused on consolidating royal power, reforming administration, and expanding influence, laying the groundwork for a unified Spain.2

Summary created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

Ask Britannica AI about this topic

Britannica doesn't have a full article on this topic, so we've curated a list of our relevant coverage.