Palingenetic ultranationalism is a theory concerning generic fascism formulated by British political theorist Roger Griffin.[1][2] The key element of this theory is the belief that fascism can be defined by its core myth, namely that of revolution in order to achieve a "national rebirth"—palingenesis.[1][2] Griffin argues that the unique synthesis of palingenesis and ultranationalism differentiates fascism from para-fascism and other authoritarian nationalist ideologies.[1][2] This is what he calls the "fascist minimum" without which there is no fascism.

https://en.wikipedia.org/wiki/Palingenetic_ultranationalism

The concept of a national or civilizational rebirth out of a morass of decadence and decline, in short.