Alfonso the Magnanimous (Alfons el Magnànim in Catalan) (139627 June 1458) was King of Aragon and King of Sicily (as Alfonso V) and the ruler of the Crown of Aragon from 1416 and King of Naples (as Alfonso I) from 1442 until his death. He was involved with struggles to the throne of the Kingdom of Naples with Louis III of Anjou, Joanna II of Naples and their supporters, but ultimately failed and lost Naples in 1424. He recaptured it in 1442 and was crowned king of Naples. He had good relations with his vassal, Stjepan Kosača, and his ally, Skanderbeg, providing assistance in their struggles in the Balkans. He led diplomatic contacts with the Ethiopian Empire and was a prominent political figure of the early Renaissance, being a supporter of literature as well as commissioning several constructions for the Castel Nuovo. 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. King Ferdinand died on 2 April 1416, and Alfonso succeeded him as king of Aragon, Valencia, and Majorca and count of Barcelona. He also claimed the island of Sardinia, though it was then in the possession of Genoa. Alfonso was also in possession of much of Corsica by the 1420s. Alfonso's marriage with Maria was childless. His mistress Lucrezia d'Alagno served as a de facto queen at the Neapolitan court as well as an inspiring muse. With another mistress, , Alfonso had three children: Ferdinand (1423–1494), Maria (who married Leonello d'Este), and Eleanor (who married Mariano Marzano). With the last mistress Ippolita, married de'Giudici, Alfonso had one daughther Colia (1430-1473/5) married in 1445 with Emanuele d'Appiano, Lord of Piombino, Count of Holy Roman Empire. The d'Appiano d'Aragona family receive, in 1509 the title of Prince of Holy Roman Empire. Alfonso was the object of diplomatic contacts from the Empire of Ethiopia. In 1428, he received a letter from Yeshaq I of Ethiopia, borne by two dignitaries, which proposed an alliance against the Muslims and would be sealed by a dual marriage that would require Alfonso's brother Peter to bring