The dictatorial regime of Francisco Franco came to power during the Spanish Civil War, which pitted a government of democrats, anarchists, socialists, and communists, supported by the Soviet Union and international volunteers, against a rebellion of conservatives, monarchists, nationalists, and fascists, supported by both Hitler and Mussolini, with the rebels ultimately winning. Franco's authoritarian government remained dominant in Spain until the 1960s. With Franco's increasing age, left-wing protests increased, while at the same time, the far right factions demanded the return of a hardline absolute monarchy. At the time, the heir to the throne of Spain was Juan de Borbón (Count of Barcelona), the son of the late Alfonso XIII. However, General Franco viewed him with extreme suspicion, believing him to be a liberal who was opposed to his regime.