Contents: Part I: The Crime of Aggression from Nuremberg to the Rome Statute: The historical background, Umberto Leanza; Origins of the criminalization of aggression: how crimes against peace became the 'Supreme International Crime', William A. Schabas; Will aggressors ever be tried before the ICC?, Muhammad Aziz Shukri; The debate within the preparatory commission for the International Criminal Court, Mauro Politi. Part II: The International Criminal Court and the Crime of Aggression: Questions of Definition and Jurisdiction: The definition of the crime of aggression and the ICC jurisdiction over that crime, Mohammed M. Gomaa; Aggression and the ICC: views on certain ideas and their potential for a solution, Phani Dascalopoulou-Livada; Defining the crime of aggression or redefining aggression?, Ioana Gabriela Stancu; Definition of the crime of aggression: state responsibility or individual criminal responsibility?, Elizabeth Wilmshurst; The crime of aggression: definitional options for the way forward, Hans-Peter Kaul; The exercise of the International Criminal Court's jurisdiction over the crime of aggression: short term and long term prospects, Antonio Yáñez-Barnuevo. Part III: The Crime of Aggression and the Relationship between the International Criminal Court and the Security Council: The respective roles of the ICC and the Security Council in determining the existence of an aggression, Giorgio Gaja; Reflections on the role of the Security Council in determining an act of aggression, Saeid Mirzaee Yengejeh; The ICC and the Security Council on aggression: overlapping competencies?, Paula Escarameia; The ICC and the Security Council: about the argument of politicization, Marja Lehto; Conclusions générales, Luigi Condorelli. Part IV: Afterword: The International Criminal Court and the Crime of Aggression: From the Preparatory Commission to the Assembly of States Parties and Beyond: An outsider's view, Giuseppe Nesi; An insider's view, Silvia A. Fernández de Gurmendi; Index.