This impressive and unique collection of essays covers important aspects of the legal regime of the International Criminal Court (ICC). The volume begins with an analysis of the historical development of the ICC, the progressive development of international humanitarian and international criminal law by the ad hoc Tribunals and the work of mixed national/international jurisdictions. The legal and institutional basis of the ICC is then dealt with in detail, including the organs of the ICC, war crimes, crimes against humanity and crimes of aggression, modes of liability before the ICC and defences before the ICC. Part III focuses on the court at work, including its procedural rules, criminal proceedings at the ICC, penalties and appeal and revision procedures. Part IV deals with the relationship of the ICC with states and international organizations. The contributors are established scholars in the field of international criminal and humanitarian law, many of whom are practitioners in the various tribunals.