County of Sicily with Robert Guiscard. In fact, the seat of Roger I's government was the Calabrian town of Mileto. According to the historians Agostino Inveges and Matteo Camera Roger I started to use the title ""Great Count of Sicily and Calabria"" since 1096. After the death of Roger I the major change was the transfer of the capital: Palermo became the capital in 1112, when Roger II was invested with the County, after the regency of the mother Adelaide del Vasto. With this change, Sicily come to be governed by the central government, while the Calabrian territories became a provincial administrative unit.
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