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.
List of monarchs of Sicily
Peter III of Aragon, Manfred's son in law, of the House of Barcelona, conquered the island of Sicily from Charles I in 1282 and had himself crowned King of Sicily. Thereafter the old Kingdom of Sicily was centred on the mainland, with capital at Naples, and although informally called Kingdom of Naples it was still known formally as "Kingdom of Sicily". Thus, there were two "Sicilies" — the island kingdom, however, was often called "Sicily beyond the Lighthouse" or "Trinacria", by terms of a treaty between the two states.