The Kingdom of Siciy is a state that exists in the south of Italy from its founding by Roger II in 1130 until 1816.

It is a successor state of the County of Sicily, which had been founded in 1071 during the Norman conquest of southern Italy.

Until 1282, the Kingdom (sometimes called the regnum Apuliae et Siciliae) covers not only the island of Sicily, but also the whole Mezzogiorno region of southern Italy and the Maltese archipelago.

The island is divided into three regions: Val di Mazara, Val Demone and Val di Noto.In 1282, a revolt against Angevin rule, known as the Sicilian Vespers, throws off Charles of Anjou's rule of the island of Sicily.

The Angevins manage to maintain control in the mainland part of the kingdom, which becomes a separate entity also styled Kingdom of Sicily, although it is commonly referred to as the Kingdom of Naples, after its capital.

The island becomes a separate kingdom under the Crown of Aragon.

After 1302, the island kingdom is sometimes called the Kingdom of Trinacria.

Often the kingship is vested in another monarch such as the King of Aragon, the King of Spain or the Holy Roman Emperor.

In 1816, the island Kingdom of Sicily merges with the Kingdom of Naples to form the Kingdom of the Two Sicilies.

In 1861, its areas are united with the Kingdom of Italy.