The three heritages of Michel de Certeau. The divided project of a theory of modernity. The heritage of Michel de Certeau has been so much scattered in different fields of research, in social sciences and in various countries that it is nearly impossible to think of an unity of his work. The history of mystics, the epistemology of history, the socio-anthropology of religion, the sociology of culture, the Cultural Studies, the research on media technologies, are now all impregnated with this concepts and results but usually do not connect them together. This paper tries to reevaluate the multiple writings of Michel de Certeau and some of their receptions in order to establish that there was no general theory of modernity in them but the me...