Kingdom of Sardinia and Aosta, dynastic possessions since the 11th century, the Principality of Piedmont (a possession built up in the 13th century), and the County of Nice (a possession since 1388). While in theory the traditional capital of the island of Sardinia and seat of its viceroys was Cagliari, the Piedmontese city of Turin was the "de facto" capital of Savoy. When the mainland domains of the House of Savoy were occupied and eventually annexed by Napoleonic France, the king of Sardinia made his permanent residence on the island for the first time in its history. The Congress of Vienna (1814–15), which
Kingdom of Sardinia victories, Napoleon thought the war too costly to continue and made a separate peace behind Cavour's back in which only Lombardy would be ceded. Due to the Austrian government's refusal to cede any lands to the Kingdom of Sardinia, they agreed to cede Lombardy to Napoleon, who in turn then ceded the territory to the Kingdom of Sardinia to avoid 'embarrassing' the defeated Austrians. Cavour angrily resigned from office when it became clear that Victor Emmanuel would accept this arrangement. On 5 March 1860, Parma, Tuscany, Modena, and Romagna voted in referenda to join the Kingdom of Sardinia. This alarmed