The World's Greatest Books — Volume 12…
“ Henry, good-natured, incompetent, and debauched, yielded himself to favourites, hence he was more than once almost rejected from his throne. Old King John II. of Aragon was similarly engaged in a long civil war, mainly owing to his tyrannous treatment of his eldest son, Carlos.But by 1468 Isabella and Ferdinand were respectively recognised as the heirs of Castile and Aragon. In spite of her brother, Isabella made contract of marriage with the heir of Aragon, the instrument securing her own sovereign rights in Castile, though Henry thereupon nominated another successor in her place. ”
