Ferdinand I (2 June 1423 – 25 January 1494), also called Don Ferrante, was the King of Naples from 1458 to 1494. He was the son of Alfonso V of Aragon and his mistress, Giraldona Carlino.
He used the title Ferdinand I, King of Naples and Jerusalem. In accordance with his father's will, Ferdinand succeeded Alfonso on the throne of Naples in 1458, when he was 35 years old, but Pope Calixtus III declared the line of Aragon extinct and the kingdom a fief of the church. Calixtus died before he could make good his claim (August 1458), and the new Pope Pius II within the year publicly recognized Ferdinand's titles.
In 1459, Ferdinand's rule was threatened by a long revolt of the barons. Among the leaders of revolt were Giovanni Antonio Orsini, Prince of Taranto, and uncle of Ferdinand's wife. The rebels joined to offer the crown to John of Anjou, son of the former king René I of Naples. With the help of the Genoese, John brought a fleet and landed, slowly taking some towns including Nocera. On July 7, 1460, Ferrante were defeated while trying to dislodge John from Sarno. Ferrante was nearly captured. Soon, two of Ferdinand's captains, Alessandro Sforza and the Count of Urbino, were also defeated in a bloody battle at San Fabriano.
More information on the English [1] and Italian [2] Wikipedia pages.