Early life Born at Medina del Campo, he was the son of Ferdinand of Trastámara and Eleanor of Alburquerque. Ferdinand was the brother of King Henry III of Castile, and Alfonso was betrothed to his uncle King Henry's daughter Maria in 1408. In 1412, Ferdinand was selected to succeed to the territories of the Crown of Aragon. Alfonso and Maria's marriage was celebrated in Valencia on 12 June 1415.
Early life Born at Medina del Campo, he was the son of Ferdinand of Trastámara and Eleanor of Alburquerque. Ferdinand was the brother of King Henry III of Castile and Alfonso was betrothed to his uncle King Henry's daughter Maria in 1408. In 1412, Ferdinand was selected to succeed to the territories of the Crown of Aragon. Alfonso and Maria's marriage was celebrated in Valencia on 12 June 1415.