Italian Fascism (Italian: Fascismo Italiano), also known simply as Fascism (Italian: Fascismo), is the original fascist ideology, as developed in Italy. The ideology is associated with the Fascist Revolutionary Party (PFR), founded in 1915, and the succeeding National Fascist Party (PNF) in 1921, which under Benito Mussolini ruled the Kingdom of Italy from 1922 until 1943, the Republican Fascist Party that ruled the Italian Social Republic from 1943 to 1945, the post-war Italian Social Movement and subsequent Italian neo-fascist movements.
Italian Fascism was rooted in Italian nationalism, revolutionary syndicalism and the desire to restore and expand Italian territories, which Italian Fascists deemed necessary for a nation to assert its superiority and strength and to avoid succumbing to decay. According to Sternhell “most syndicalist leaders were among the founders of the Fascist movement,” who, in later years, gained key posts in Mussolini’s regime. Mussolini asserted that the French Marxist and revolutionary syndicalist Georges Sorel was his “master,” who he claimed was instrumental in birthing the core principles of Italian fascism, that eventually “fused socialism with nationalism.” Other historians argued that Fascism billed itself “not only as an alternative, but also as the heir to socialism.” Italian Fascists also claimed that modern Italy is the heir to ancient Rome and its legacy, and historically supported the creation of an Italian Empire to provide spazio vitale ("living space") for colonization by Italian settlers and to establish control over the Mediterranean Sea.