John II of Castile
John II of Castile Spanish: Juan; 6 March 1405 – 20 July 1454 was King of Castile & León from 1406 to 1454. He succeeded his older sister, Maria of Castile, Queen of Aragon, as Prince of Asturias in 1405.
Regency
John was the son of King Henry III in addition to his wife, Catherine of Lancaster. His mother was the granddaughter of King Peter, who was ousted by Henry III's grandfather, King Henry II. John succeeded his father on 25 December 1406, and united in his grownup 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.