Defence date: 9 January 2015Examining Board: Professor Martin van Gelderen, European University Institute /Lichtenberg Kolleg, Universität Göttingen (Supervisor) Professor Laura Lee Downs, European University Institute Professor Gareth Stedman Jones, University of Cambridge Professor Nadia Urbinati, Columbia University, New York.Against an established but substantially mistaken consensus, this intellectual biography suggests that a contextually informed reading of Sorel's work invalidates both the supposedly 'irrationalist' character of his theoretical elaboration and the interpretation of his syndicalism as a theory of insurrection for insurrections' sake.This is done by showing that Sorel's understanding of historical materialism was deci...