Castile and Leon (Spain) - 1418-1454 - John II of Castile (Spanish: Juan; 6 March 1405 – 20 July 1454) was King of Castile[1] and León from 1406 to 1454. He succeeded his older sister, Maria of Castile, Queen of Aragon, as Prince of Asturias in 1405.
 
John was the son of King Henry III and his wife, Catherine of Lancaster, a granddaughter of King Peter; Peter had been ousted by Henry III's grandfather King Henry II. 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.