County of Sicily was created by Robert Guiscard in 1071 for his younger brother Roger Bosso. Guiscard himself had received the title Duke of Sicily ("dux Siciliae") in 1059 from Pope Nicholas II as encouragement to conquer it from the Muslims. In 1061 the first permanent Norman conquest (Messina) was made and in 1071, after the fall of Palermo, the capital of the emirate and future capital of the county, Guiscard invested Roger with the title of count and gave him full jurisdiction in the island save for half the city of Palermo, Messina, and the Val Demone, which he retained for himself.
Kingdom of Sicily of Sicily merged with the Kingdom of Naples to form the Kingdom of the Two Sicilies. In 1861 the Two Sicilies were amalgamated with Sardinia and several northern city-states and duchies to form the Kingdom of Italy. By the 11th century mainland southern Lombard and Byzantine powers were hiring Norman mercenaries, who were descendants of the Vikings; it was the Normans under Roger I who conquered Sicily, taking it away from the Arab Muslims. After taking Apulia and Calabria, Roger occupied Messina with an army of 700 knights. In 1068, Roger I of Sicily and his men defeated the Muslims