Roger II of Sicily in the context of "Familiaris (Kingdom of Hungary)"

The Kingdom of Sicily (Latin: Regnum Siciliae; Sicilian: Regnu di Sicilia; Italian: Regno di Sicilia) was a state that existed in Sicily and the southern Italian Peninsula as well as, for a time, in Northern Africa, 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.

After a brief rule by Charles of Anjou, a revolt in 1282 known as the Sicilian Vespers threw off Angevin rule in the island of Sicily. The Angevins managed to maintain control in the mainland part of the kingdom, which became a separate entity also styled Kingdom of Sicily, although it is retroactively referred to as the Kingdom of Naples. The Kingdom of Sicily on the island(also known as Kingdom of Trinacria between 1282 and 1442) on the other hand, remained an independent kingdom ruled by relatives of the House of Barcelona, and was then added permanently to the Crown of Aragon as a result of the Compromise of Caspe of 1412. Following the dynastic union of the crowns of Castile and Aragon in 1479, it was a viceroyalty of the Spanish kingdom. During the War of the Spanish Succession (1700–1714), the island was taken over by the House of Savoy. In 1720, Savoy gave it to Austria in exchange for Sardinia. Later, the island was ruled by a branch of the Bourbons. Following the Napoleonic period, the Kingdom of Sicily was formally merged with the Kingdom of Naples to form the Kingdom of the Two Sicilies, which in 1861 became part of the new unified Kingdom of Italy.

The Palatine Chapel /ˈpælətaɪn ˈtʃæpəl/ (Italian: Cappella Palatina) is the royal chapel of the Norman Palace in Palermo, Sicily. This building is a mixture of Byzantine, Norman and Fatimid architectural styles, showing the tricultural state of Sicily during the 12th century after Roger I and Robert Guiscard conquered the island.

Also referred to as a Palace church or Palace chapel, it was commissioned by Roger II of Sicily in 1132 to be built upon an older chapel (now the crypt) constructed around 1080. It took eight years to build, receiving a royal charter the same year, with the mosaics being only partially finished by 1143. The sanctuary, dedicated to Saint Peter, is reminiscent of a domed basilica. It has three apses, as is usual in Byzantine architecture, with six pointed arches (three on each side of the central nave) resting on recycled classical columns. The muqarnas ceiling of the nave and the chapel's rectilinear form show the Fatimid influence in the building's construction.

The history of Sicily has been influenced by numerous ethnic groups. It has seen Sicily controlled by powers, including Carthaginian, Greek, Roman, Vandal and Ostrogoth, Byzantine, Arab, Norman, Aragonese, Spanish, Austrians, but also experiencing important periods of independence, as under the indigenous Sicanians, Elymians, Sicels, the Greek-Siceliotes (in particular Syracuse with its sovereigns), and later as County of Sicily, and Kingdom of Sicily. The Kingdom was founded in 1130 by Roger II, belonging to the Siculo-Norman family of Hauteville. During this period, Sicily was prosperous and politically powerful, becoming one of the wealthiest states in all of Europe. As a result of the dynastic succession, the Kingdom passed into the hands of the Hohenstaufen. At the end of the 13th century, with the War of the Sicilian Vespers between the crowns of Anjou and Aragon, the island passed to the latter. In the following centuries the Kingdom entered into the personal union with the Spaniard and Bourbon crowns, while preserving effective independence until 1816. Sicily was merged with the Kingdom of Italy in 1861.Although today an Autonomous Region, with special statute, of the Republic of Italy, it has its own distinct culture.

Sicily is both the largest region of the modern state of Italy and the largest island in the Mediterranean Sea. Its central location and natural resources ensured that it has been considered a crucial strategic location due in large part to its importance for Mediterranean trade routes. Cicero and al-Idrisi described respectively Syracuse and Palermo as the greatest and most beautiful cities of the Hellenic World and of the Middle Ages.

Simon (fl. 1162) was the Norman Count of Syracuse and a member of the Hauteville family. He may be an illegitimate son of Roger II of Sicily, but more likely a son of Henry, Count of Paterno, the brother-in-law of Roger I. He was probably a descendant of his predecessor Tancred.

In 1162, when Frederick Barbarossa was seeking allies for a planned invasion of the Kingdom of Sicily, he made a treaty with the Republic of Genoa, offering them the entire Ligurian coast and the lands of Simon in Sicily. These lands included the cities of Syracuse and Noto and 250 knight's fees (caballariae) in the fertile plain around Noto, the Val di Noto. When the Emperor Henry VI reissued his father's charter to Genoa on 30 May 1191, he retained the promise of Simon's lands, even though Simon was by then dead.

Frederick II (Italian: Federico, Sicilian: Fidiricu, German: Friedrich, Latin: Fridericus; 26 December 1194 – 13 December 1250) was King of Sicily from 1198, King of Germany from 1212, King of Italy and Holy Roman Emperor from 1220 and King of Jerusalem from 1225. He was the son of Emperor Henry VI of the Hohenstaufen dynasty (the second son of Emperor Frederick Barbarossa) and Queen Constance I of Sicily of the Hauteville dynasty.

Frederick was one of the most brilliant and powerful figures of the Middle Ages and ruled a vast area, beginning with Sicily and stretching through Italy all the way north to Germany. Viewing himself as a direct successor to the Roman emperors of antiquity, he was Emperor of the Romans from his papal coronation in 1220 until his death; he was also a claimant to the title of King of the Romans from 1212 and unopposed holder of that monarchy from 1215. As such, he was King of Germany, of Italy, and of Burgundy. At the age of three, he was crowned King of Sicily as co-ruler with his mother, Constance, Queen of Sicily, the daughter of Roger II of Sicily. His other royal title was King of Jerusalem by virtue of marriage and his connection with the Sixth Crusade. Frequently at war with the papacy, which was hemmed in between Frederick's lands in northern Italy and his Kingdom of Sicily (the Regno) to the south, he was "excommunicated four times between 1227 and his own death in 1250", and was often vilified in pro-papal chronicles of the time and after. Pope Innocent IV went so far as to declare him preambulus Antichristi (forerunner of the Antichrist).

The Hauteville family (Italian: Altavilla, Sicilian: Autaviḍḍa) was a Norman family, originally of petty lords, from the Cotentin Peninsula in Normandy. The Hautevilles rose to prominence through their part in the Norman conquest of southern Italy. In 1130, Roger II of Hauteville, was made the first King of Sicily. His male-line descendants ruled the kingdom until 1194. The Hauteville also took part in the First Crusade and ruled the independent Principality of Antioch (1098).

Abu Abdullah Muhammad al-Idrisi al-Qurtubi al-Hasani as-Sabti, or simply al-Idrisi /ælɪˈdriːsiː/ (Arabic: أبو عبد الله محمد الإدريسي القرطبي الحسني السبتي; Latin: Dreses; 1100–1165), was an Arab Muslim geographer and cartographer who served in the court of King Roger II at Palermo, Sicily. Muhammad al-Idrisi was born in Ceuta, then belonging to the Almoravid dynasty. He created the Tabula Rogeriana, one of the most advanced medieval world maps. al-Idrisi stands as one of the most celebrated cartographers and geographical scholars from the Islamic world, exemplifying the intellectual figures who preserved and advanced the Arabic culture and traditions during the Era of the Normans in medieval Sicily.

Géza II (Hungarian: II. Géza; Croatian: Gejza II.; Slovak: Gejza II.; 1130 – 31 May 1162) was King of Hungary and Croatia from 1141 to 1162. He was the oldest son of Béla the Blind and his wife, Helena of Serbia. When his father died, Géza was still a child and he started ruling under the guardianship of his mother and her brother, Beloš. A pretender to the throne, Boris Kalamanos, who had already claimed Hungary during Béla the Blind's reign, temporarily captured Pressburg (now Bratislava in Slovakia) with the assistance of German mercenaries in early 1146. In retaliation, Géza who came of age in the same year, invaded Austria and routed Henry Jasomirgott, Margrave of Austria, in the Battle of the Fischa.

Although the German–Hungarian relations remained tense, no major confrontations occurred when the German crusaders marched through Hungary in June 1147. Two months later, Louis VII of France and his crusaders arrived, along with Boris Kalamanos who attempted to take advantage of the crusade to return to Hungary. Louis VII refused to extradite Boris to Géza, but prevented the pretender from contacting his supporters in Hungary and managed to shepherd him to Constantinople with the rest of the crusaders. Géza joined the coalition that Louis VII and Roger II of Sicily formed against Conrad III of Germany and Byzantine emperor Manuel I Komnenos.

The term Norman–Arab–Byzantine culture, Norman–Sicilian culture or, less inclusively, Norman–Arab culture, (sometimes referred to as the "Arab-Norman civilization") refers to the interaction of the Norman, Byzantine Greek, Latin, and Arab cultures following the Norman conquest of the former Emirate of Sicily and North Africa from 1061 to around 1250. The civilization resulted from numerous exchanges in the cultural and scientific fields, based on the tolerance shown by the Normans towards the Latin- and Greek-speaking Christian populations and the former Arab Muslim settlers. As a result, Sicily under the Normans became a crossroad for the interaction between the Norman and Latin Catholic, Byzantine–Orthodox, and Arab–Islamic cultures.