History of Sardinia
In the Early Middle Ages, through barbarian movements, the waning of the Byzantine Empire influence in the western Mediterranean and the Saracen raids, the island fell out of the sphere of influence of any higher government. This led to the birth of four kingdoms called "Judicates" (Latin: "Judicati"; Sardinian: "Judicados") in the 8th through 10th centuries. Falling under papal influence, Sardinia became the focus of the rivalry of Genoa and Pisa, the Judicates and the Crown of Aragon, which eventually subsumed the island as the Kingdom of Sardinia in 1324. The Kingdom was to last until 1718, when it was ceded to the Piedmontese House of Savoy; later, in 1861, it would thus become the Kingdom of Italy and finally in 1946 the Italian Republic.
Italy
In 1860–1861, Garibaldi led the drive for unification in Naples and Sicily (the Expedition of the Thousand), while the House of Savoy troops occupied the central territories of the Italian peninsula, except Rome and part of Papal States. Teano was the site of the famous meeting of 26 October 1860 between Giuseppe Garibaldi and Victor Emmanuel II, last King of Sardinia, in which Garibaldi shook Victor Emanuel's hand and hailed him as King of Italy; thus, Garibaldi sacrificed republican hopes for the sake of Italian unity under a monarchy. Cavour agreed to include Garibaldi's Southern Italy allowing it to join the union with the Kingdom of Sardinia in 1860. This allowed the Sardinian government to declare a united Italian kingdom on 17 March 1861. Victor Emmanuel II then became the first king of a united Italy, and the capital was moved from Turin to Florence.