Henry IV of Castile (Castilian: Enrique IV) was born on January 5, 1425 and died on December 11, 1474.

He was the son of John II of Castile and Maria of Aragon, daughter of King Ferdinand I of Aragon. He displaced his older sister, Eleanor, and became heir apparent to the Castilian throne as the Prince of Asturias.

On October 10, 1444, he became the first and only prince of Jaén.

On July 20, 1454, his father died and he was proclaimed king the following day (ruled 1454–1474). As king, he was nicknamed the 'Impotent', being the last of the weak late medieval kings of Castile. During Henry's reign the nobles increased in power and the nation became less centralized.

One of King Henry's first priorities was the alliance with Portugal. He achieved this by marrying a second time to Joan of Portugal, daughter of King Edward of Portugal in 1455. Another factor, was meeting her brother King Afonso V of Portugal in Elvas to form an alliance the following year. His other concerns revolved around off-setting the possible intervention from King John II of Navarre, and establishing peace with France and Aragon, and pardoning various aristocrats.

After his death, war broke out in Castile. Joanna was supported by Portugal, while the eventual winner, Henry's half-sister Isabella I of Castile, had the support of Aragon. France initially supported Joanna, yet in 1476, after losing the Battle of Toro, France refused to help Joanna, further and in 1478 signed a peace treaty with Isabella.


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