International Criminal Justice is a controversial concept, and there is a burgeoning body of literature on its exact contours. Understood broadly, the term “international criminal justice” covers a broad category, integrating international criminal law (ICL) within an overarching interdisciplinary enterprise also “incorporating philosophical, historical, political and international relations, sociological, anthropological and criminological perspectives” (Roberts, 2007). International criminal law consists, at its core, of a combination of criminal law and public international law principles. The idea of individual criminal responsibility and the concept of prosecuting an individual for a specific (macrocriminal) act are derived from criminal law, while the classical (Nuremberg) offenses form part of (public) international law and thus the respective conduct is directly punishable under ICL (principle of direct individual criminal responsibility in public international law). The dualistic base of international criminal law is also reflected in the reading of the mandates of the international criminal tribunals; one can either take a “security, peace, and human rights”–oriented approach or a “criminal justice”–oriented approach, either of which may entail a paradoxical goal or purpose ambiguity of international criminal law. In any case, the strong grounding in criminal law, together with the actual enforcement of international criminal law by way of international criminal proceedings and trials, converts international criminal law into criminal law on a supranational level and thus entails the full application of the well-known principles of liberal, post-enlightenment criminal law, in particular the principles of legality, culpability, and fairness. These principles constitute the minimum standard of any criminal justice system based on the rule of law and thus must also apply in an international criminal justice system. The adoption of the Rome Statute of the International Criminal Court (ICC) in 1998 and the effective establishment of the Court in 2002 have led to an institutionalization of international criminal law, turning the page on ad hoc imposition in favor of a treaty-based universal system. In addition, the Rome Statute provides for the first codification of international criminal law, with a potentially universal reach. Therewith, international criminal law was not only united into a single penal system of the international community, but it was also extended beyond its fundamental core areas of substantive and procedural law into other branches of criminal law (law of sanctions, enforcement of sentences, and judicial assistance).