The Kingdom of Naples, also known as the Kingdom of Sicily, was a state that ruled the part of the Italian Peninsula south of the Papal States between 1282 and 1816. It was established by the War of the Sicilian Vespers, when the island of Sicily revolted and was conquered by the Crown of Aragon, becoming a separate kingdom also called the Kingdom of Sicily. In 1816, it reunified with the island of Sicily to form the Kingdom of the Two Sicilies.
The territory of the Kingdom of Naples, corresponded to the current Italian regions of Campania, Calabria, Apulia, Basilicata, Abruzzo, Molise and also included some areas of today's southern and eastern Lazio.