John was the son ofKing Henry III and his wife,Catherine of Lancaster, a granddaughter ofKing Peter; Peter had been ousted by Henry III's grandfatherKing Henry II.[2] John succeeded his father on 25 December 1406, and united in his person the claims of both Peter and Henry II. His mother and his uncle,King Ferdinand I of Aragon, were co-regents during his minority. When Ferdinand I died in 1416, his mother governed alone until her death in 1418.
Born on 6 March 1405, John II of Castile was under theguardianship of Diego López de Medrano, from the House of the Lords of San Gregorio inSoria, who also served as hismayordomo.[8][9] He spent his time verse-making, hunting, and holding tournaments. Hisfavourite,Álvaro de Luna, heavily influenced him until his second wife,Isabella of Portugal, obtained control of his feeble will. At her instigation, he dismissed and executed his faithful and able servant, an act which is said to have caused him much remorse.[10] The relationship between Álvaro and Juan has been described by some aspederastic.[3]
John II's Regents declared the Valladolid laws in 1411, which restricted the social activity ofJews. Among the most notable of the provisions were outlining that Jews must wear distinctive clothes and banned them from holding administrative positions.[11] However, once John took control of the throne for himself in 1418, he (though likely influenced politically by de Luna) reversed such ordinances, favoring instead a more tolerant attitude toward the already battered Jewish population of Castile following the mass wave of conversions between 1391 and 1415.
He was "[T]all and handsome, fair-skinned and slightly ruddy... his hair was the color of a very mature hazelnut, the nose a little snub, the eyes between green and blue... he had very graceful legs and feet and hands."[13]
John II was the single largest contributor to the continuing construction of theAlcázar of Segovia and built the "New Tower" known today as the "Tower of John II".