This anthology is important for several reasons. First, it brings together a diversity of quality contributions on difficult current topics such as the reach of universal criminal jurisdiction for serious international crimes, immunity of State officials in respect of such crimes, and the consequences of the criminalisation of aggression in the context of the Rome Statute of the International Criminal Court. These are three clusters of controversy subject to intense discussions in international courts, between governments, and among academics. The present book contributes to those discussions.