John I was King of Castile and León from 1379 until 1390. He was the son of Henry II and of his wife Juana Manuel of Castile. Wikipedia
Born: August 24, 1358, Épila, Spain
Died: October 9, 1390 (age 32 years), Alcala de Henares, Spain
Parents: Henry II of Castile and Juana Manuel
Great grandchildren: Isabella I of Castile, Ferdinand II of Aragon, Henry IV of Castile, and more
Grandchildren: John II of Castile, John II of Aragon, Alfonso V of Aragon, and more
Grandparents: Alfonso XI of Castile, Eleanor de Guzmán, Juan Manuel, and more