During the last decade international criminal law has developed rapidly. Principles of International Criminal Law takes up these developments to provide comprehensive coverage of substantive international criminal law. Gerhard Werle deals with the general principles of international criminal law as well as with individual crimes, such as genocide, crimes against humanity, war crimes and the crime of aggression. Fundamental issues, such as the evolution, sources and enforcement of international criminal law are included. The book analyzes the Rome Statute of the International Criminal Court as well as customary international law. The case law of the ICTY and the ICTR as well as that of several national courts is extensively covered. The systematic and thorough approach adopted by the author makes this book indispensable for anyone involved in and interested in the attainment and development of international criminal law.