The history of Sicily has been influenced by numerous ethnic groups. It has seen Sicily sometimes controlled by external powers — Roman, Vandal and Ostrogoth, Byzantine and Islamic — but also experiencing important periods of independence, as under the Siceliotes of Greek origin and later as the autonomous Emirate then 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, then, 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, preserving however its substantial independence until 1816. Although today part 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. For example, with Cicero and al-Idrisi describing respectively Syracuse and Palermo as the greatest and most beautiful cities of the Hellenic World and of the Middle Ages.