Henry IV of Castile

Henry IV of Castile (Castilian: Enrique IV; 5 January 1425 – 11 December 1474), nicknamed the Impotent, was King of Castile and León and the last of the weak late-medieval kings of Castile and León. During Henry's reign, the nobles became more powerful and the nation became less centralised. Early life Henry was born in 1425 at the Casa de las Aldabas (since destroyed) in Teresa Gil street of Valladolid. 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. At the time of his birth, Castile was under control of Álvaro de Luna, Duke of Trujillo, who intended to select Henry's companions and direct his education. The companions of his own age included Juan Pacheco, who became his closest confidant. The struggles, reconciliations and intrigues for power among the aristocracy, Álvaro de Luna, and the Infantes of Aragon would be constant. On 10 October 1444, he became the first and only prince of Jaén. In 1445 he won the First Battle of Olmedo, defeating the Infantes of Aragon. After the victory at Olmedo, Álvaro de Luna's power waned, and Prince Henry and Juan Pacheco's influence grew.