Roger Griffin in the context of "Palingenesis"

The history of fascist ideology is long and draws on many sources. Fascists took inspiration from sources as ancient as the Spartans for their focus on racial purity and their emphasis on rule by an elite minority. Researchers have also seen links between fascism and the ideals of Plato, though there are key differences between the two. Italian Fascism styled itself as the ideological successor to Ancient Rome, particularly the Roman Empire. Georg Wilhelm Friedrich Hegel's view on the absolute authority of the state also strongly influenced fascist thinking. The 1789 French Revolution was a major influence insofar as the Nazis saw themselves as fighting back against many of the ideas which it brought to prominence, especially liberalism, liberal democracy and racial equality, whereas on the other hand, fascism drew heavily on the revolutionary ideal of nationalism. The prejudice of a "high and noble" Aryan culture as opposed to a "parasitic" Semitic culture was core to Nazi racial views, while other early forms of fascism concerned themselves with non-racialized conceptions of their respective nations.

Common themes among fascist movements include: authoritarianism, nationalism (including racial nationalism and religious nationalism), hierarchy, elitism, and militarism. Other aspects of fascism – such as a perception of decadence, anti-egalitarianism and totalitarianism – can be seen to originate from these ideas. Roger Griffin has proposed that fascism is a synthesis of totalitarianism and ultranationalism sacralized through a myth of national rebirth and regeneration, which he terms "palingenetic ultranationalism".

Para-fascism are authoritarian conservative movements and regimes that adopt characteristics associated with fascism such as personality cults, paramilitary organizations, symbols and rhetoric, while diverging from conventional fascist tenets such as palingenetic ultranationalism, modernism, and populism. Para-fascism often emerges in response to the need for a facade of popular support in an age of mass politics, without a genuine commitment to revolutionary nationalism, instead focusing on maintaining tradition, religion, and culture. Para-fascist regimes may co-opt or neutralize genuine fascist movements.

The historian Roger Griffin defines the following regimes and movements as para-fascist: Austrofascism in the Federal State of Austria led by Engelbert Dollfuss and Kurt Schuschnigg, Metaxism in the Greek '4th of August Regime', the "New State" of António de Oliveira Salazar's Portugal, the Bando nacional and the FET y de las JONS led by Francisco Franco in the Spanish State, Kingdom of Hungary led by Miklós Horthy, and the Révolution nationale in Vichy France led by Philippe Petain; the dictatorships of Carol II and Ion Antonescu in the Kingdom of Romania, Miguel Primo de Rivera's dictatorship in Spain and Antanas Smetona's Lithuanian Nationalist Union in Lithuania have also been referred to as para-fascist. While most historians of fascism agree that these regimes were not totally fascist, many authors do acknowledge that they have some kind of connection with fascism, either by being partially influenced by it or by co-opting some genuine fascist groups. The words used by different historians to characterize these conservative regimes include, apart from parafascism: semi-fascist, fascisant, fascistic, fascistized, quasi-fascist, and others.

Ultranationalism, or extreme nationalism, is an extremist form of nationalism in which a country asserts or maintains hegemony, supremacy, or other forms of control over other nations (usually through violent coercion) to pursue its specific interests. Ultranationalist entities have been associated with the engagement of political violence even during peacetime.

In ideological terms the British political theorist Roger Griffin said that ultranationalism arises from seeing modern nation states as living organisms, and that in stark mythological ways, political campaigners have divided societies into those that are perceived as being degenerately inferior and those perceived as having great cultural destinies. Ultranationalism has been an aspect of fascism, with historic governments such as the regimes of Fascist Italy and Nazi Germany building on ultranationalist foundations by using specific plans for supposed widespread national renewal. Another major example was the Khmer Rouge regime in Democratic Kampuchea (Cambodia) that promoted ultranationalism.

Palingenetic ultranationalism is a definition of "true fascism" proposed by political theorist Roger Griffin. The phrase was first coined by Griffin in his 1991 book The Nature of Fascism. A key element is the belief that fascism can be defined by what Griffin posits in his book to be the true core myth of fascism, namely that of the need for a social revolution to occur first before a "national rebirth", palingenesis, could then take place.

Griffin argues that the unique synthesis of palingenesis, populism and ultranationalism differentiates fascism from para-fascism and other authoritarian, nationalist ideologies. He asserts that this is the "fascist minimum" without which, according to his definition, there can be no "true fascism". Griffin himself describes fascism as a political philosophy built on the "perverse mythic logic" of destruction, which the fascist believes will then be followed by some form of political rebirth.