He was the only King of Spain from the House of Savoy. He was the second son of King Vittorio Emanuele II of Italy, he reigned briefly as King of Spain from.
He was elected by the Cortes as Spain's monarch in 1870, following the deposition of Isabella II.
Amadeo's reign was fraught with growing republicanism, Carlist rebellions in the north, and the Cuban independence.
He abdicated and returned to Italy in 1873, and the First Spanish Republic was declared as a result.