Kingdom of Sardinia
On 17 March 1861, law no. 4671 of the Sardinian Parliament proclaimed the Kingdom of Italy, so ratifying the annexations of all other Apennine states, plus Sicily, to the Kingdom of Sardinia. The institutions and laws of the Kingdom were quickly extended to all of Italy, abolishing the administrations of the other regions. Piedmont became the most dominant and wealthiest region in Italy and the capital of Piedmont, Turin, remained the Italian capital until 1865, when the capital was moved to Florence. But many revolts exploded throughout the peninsula, especially in southern Italy, and on the island of Sicily, because of the perceived unfair treatment of the south by the Piedmontese ruling class. The House of Savoy ruled Italy until 1946 when Italy was declared a republic by referendum. In this referendum the southern regions, including Sardinia, voted overwhelmingly in favor of the House of Savoy, with the results being 63.8% in favor of maintaining the monarchy.
History of Italy
The few independent city-states were also subdued. During the same period, the Normans also ended Muslim rule in Sicily. In 1130, Roger II of Sicily began his rule of the Norman Kingdom of Sicily. Roger II was the first King of Sicily and had succeeded in uniting all the Norman conquests in Southern Italy into one kingdom with a strong centralized government. In 1155, Emperor Manuel Komnenos attempted to regain Southern Italy from the Normans, but the attempt failed and in 1158 the Byzantines left Italy. The Norman Kingdom of Sicily lasted until 1194 when Sicily was claimed by the German Hohenstaufen Dynasty. The Kingdom of Sicily would last under various dynasties until the 19th century.