“One day”, Michel Foucault postulates, “the history of what would be called revolutionary subjectivity should be written”. People’s relations towards revolutionary experiences change, and Foucault thinks at a certain point one influential idea emerged: revolutionary processes could transform people’s personality, giving birth to revolutionary characters. I will follow Foucault’s suggestion, but limit myself to investigate the origins of this idea; more specifically, I want to test Foucault’s hypothesis that the origin should be found during 1840-1850. I will first give an overview of the traces of this idea in the writings of the revolutionaries in the post-WWII twentieth century, especially Fanon and Mao, at the moment when theorization of revolutionary subjectivity became a prominent topic of discussion. Then I will explore how revolutionaries of 1848 and revolutionaries of the 1789 French Revolution relate to their revolutionary experiences, which would test Foucault’s hypothesis on revolutionary subjectivity. At the end I discuss the research’s contemporary relevance.