Abstract
To flee the community is not only to leave the living, but to leave the dead ; how then " faire mourir les morts ", to use Marcel Détienne's expression, if not by telling the story of origins ? Drawing on both Florence Dupont's analysis of theorigo of the Romans and Claudia Moatti's on their res publica as " social aptitude for political imagination, otherness and alteration ", the session takes up anew the classic question of the revival of the Trojan origins myth in the founding narratives of European peoples. Beyond the " myth of collective ennoblement " (Colette Beaune), this reference to Aeneas' adventure perhaps expresses the temptation of a heterochthonous model of power legitimization. This allows us to formulate a second general hypothesis relating to medieval societies : the system of powers holds together because it makes possible, or thinkable, the possibility of another political future, which it keeps at a distance but within sight, in faraway places, fictions, or heterotopic forms of community.