Moving from the analogy with Spinoza, the essay defines the figure and the work of Foucault as a unique and particular event and as the effect of some specific historical and intellectual processes. The heresy of Foucault is thus unexpectedly preceded by George Lukács' History and Class Consciousness, while at the same time it must be linked with the philosophy of Maurice Merleau-Ponty: in both cases there are at stake an “open” history and a dialectics without a possible synthesis. These same elements return in the way Foucault shows the radical historicity of political subjects and of power itself. This story, which is dispelled in the multiplicity of its processes and events, becomes a space for Foucault's political ontology and allows defining him a political philosopher of history.