The first fort was built in 474 BC Greek from Syracuse Hiero I, came to the aid of Cumani in the war against Tirreni. Following the victorious battle, which took place today in the waters off the town of Lacco Ameno, Hiero I got in return the island of Ischia and the Castle. In 315 BC the Romans founded the city of Ischia Aenaria and, most likely, used the castle as a defensive fort and built some houses
. In the centuries after the looting and the long domination of the Visigoths, Vandals, Goths, Arabs, Normans, Swabians and completely transformed the Angevin Fortress Hieron. The eruption of Mount Trippodi, which occurred in 1301, represented a significant boost to the development of the settlement on the Castle: The Ischia took refuge on the rock that provided security and peace of mind and gave life to a real town. In 1441 Alfonso of Aragon rebuilt the old male of Angevin, joined the island to the island increased with an artificial bridge and built strong walls and fortifications, in which almost all the people of Ischia found refuge and protection against to the pirates. The heyday for the Castle occurred in the late sixteenth century when the fortress housed 1892 families, as well as the Convent of the Poor Clares, the Basilian Abbey of Greece, the Bishop and the Chapter Seminar, the Prince with the garrison. There were 13 churches, of which seven parishes. Around 1750, when the danger of pirates, people are looking more comfortable stay in various towns of the island of Ischia in search of new land to cultivate and lead to better fishing activity. In 1809 the English besieged the castle, held by the French, and shelled to destroy almost completely. In 1823 Ferdinand I, King of Naples, he sent away the last 30 inhabitants and reduced the Castle as a place of punishment for convicts. In 1851 he used it as a political prison for those men who were opposed to the power of the Bourbons. In 1860, with the arrival of Garibaldi in Naples, Ischia political prison was closed and joined to the Kingdom of Italy. The June 8, 1912 the Administration of State Property, by private treaty, auction began in the Castello Aragonese: from that moment the rock is in the hands of individuals who look after the restoration and management.