
The Kingdom of Sicily was a state that existed in the south of the Italian peninsula and for a time the region of Ifriqiya from its founding by Roger II of Sicily in 1130 until 1816. It was a successor state of the County of Sicily, which had been founded in 1071 during the Norman conquest of the southern peninsula. The island was divided into three regions: Val di Mazara, Val Demone and Val di Noto; val being the apocopic form of the word vallo, derived from the Arabic word wilāya.
The County Palatine of Cephalonia and Zakynthos existed from 1185 to 1479 as part of the Kingdom of Sicily. The title and the right to rule the Ionian islands of Cephalonia and Zakynthos was originally given to Margaritus of Brindisi for his services to William II, King of Sicily, in 1185.

The Duchy of Athens was one of the Crusader states set up in Greece after the conquest of the Byzantine Empire during the Fourth Crusade as part of the process known as Frankokratia, encompassing the regions of Attica and Boeotia, and surviving until its conquest by the Ottoman Empire in the 15th century.

Tripoli, today the capital city of Libya, was ruled by the Knights Hospitaller as their only territory in North Africa between 1530 and 1551. The city had been under Spanish rule for two decades before it was granted as a fief to the Hospitallers in 1530 along with the islands of Malta and Gozo. The Hospitallers found it difficult to control both the city and the islands, and at times they proposed to either move their headquarters to Tripoli or to abandon and raze the city. Hospitaller rule over Tripoli ended in 1551 when the city was captured by the Ottoman Empire following a siege.

Malta Protectorate was the political term for Malta when it was officially part of the Kingdom of Sicily but under British protection. This protectorate happened between the capitulation of the French forces in Malta in 1800 and the transformation of the islands to a Crown colony in 1813.

In southern Italy, the oncia or onza was a unit of account during the Middle Ages and later a gold coin minted between 1732 and 1860. It was also minted in the Spanish Empire, and a silver coin of the same value was minted by the Knights of Malta. The name is derived from the ancient Roman uncia. It may sometimes be translated ounce.

The Sicilian Parliament was the legislature of the Kingdom of Sicily.

Tripoli, today the capital city of Libya, was a presidio of the Spanish Empire in North Africa between 1510 and 1530. The city was captured by Spanish forces in July 1510, and for the next two decades it was administered as an outpost which fell under the jurisdiction of the Spanish Viceroy of Sicily. The city was granted as a fief to the Knights Hospitaller in 1530, and the latter ruled the city until 1551.

The Terra di Bari, in antiquity Peucetia and in the Middle Ages Ager Barianus, is the region around Bari in Apulia. Historically it was one of the justiciarships of the Kingdom of Sicily and later Naples. It became a province in the Two Sicilies. Today it is a part of the Province of Bari in Italy. Since 2005, according to the municipal government of Bari, it refers to the metropolitan area of the city and is trademarked for touristic purposes.

The Terra di Otranto, or Terra d’Otranto, is an historical and geographical region of Apulia, largely corresponding to the Salento peninsula, anciently part of the Kingdom of Sicily and later of the Kingdom of Naples, which became a province of the Kingdom of the Two Sicilies.