The book provides a holistic examination of the jurisdiction of the International Criminal Court (ICC). The main focus is placed on the three pillars which form the ICC¿s foundation pursuant to the Rome Statute: the preconditions to the exercise of its jurisdiction (Article 12 Rome Statute) the substantive competence, i.e. the core crimes (Article 5-8bis Rome Statute, i.e. genocide, crimes against humanity, war crimes, crime of aggression) the principle of complementarity (Article 17§1 (a) Rome Statute) The latter governs the ICC's ¿ultimate jurisdiction¿, since it is not merely sufficient for a crime to be within the Court's jurisdiction (according to the substantive, geographical, personal and temporal jurisdictional criteria), but the State Party must also be unwilling or unable genuinely to carry out