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.
Kingdom of Sicily
From 1713 until 1720 the Kingdom of Sicily was ruled briefly by the House of Savoy, which had received it by the terms of the Treaty of Utrecht, which brought an end to the War of the Spanish Succession. The kingdom was a reward to the Savoyards, who were thus elevated to royal rank. The new king, Victor Amadeus II, travelled to Sicily in 1713 and remained a year before returning to his mainland capital, Turin, where his son the Prince of Piedmont had been acting as regent. In Spain the results of the war had not been truly accepted, and the War of the Quadruple Alliance was the result. Sicily was occupied by Spain in 1718. When it became evident that Savoy had not the strength to defend as remote a country as Sicily, Austria stepped in and exchanged its Kingdom of Sardinia for Sicily. Victor Amadeus protested this exchange, Sicily being a rich country of over one million inhabitants and Sardinia a poor country of a few hundred thousand, but he was unable to resist his "allies". Spain was finally defeated in 1720, and the Treaty of the Hague ratified the changeover. Sicily belonged to the Austrian Habsburgs, who already ruled Naples. Victor Amadeus, for his part, continued to protest for three years, and only in 1723 decided to recognize the exchange and desist from using the Sicilian royal title and its subsidiary titles (such as King of Cyprus and Jerusalem).