The Rome Statute of the International Criminal Court (or Rome Statute) is the treaty which established the International Criminal Court (ICC). It entered into force in 2002. Since it is a treaty that establishes an international court, it is called a Statute (note this is a different usage of the word "statute" from that commonly used in law.)

The Statute provides for the ICC to have jurisdiction over three main classes of offences: genocide, crimes against humanity and war crimes. The treaty establishing the court gives a specific definition of genocide in Article 6, a list of crimes against humanity in Article 7, a lengthy and detailed list of war crimes in Article 8. The Statute also provides for the court to have jurisdiction over the crime of aggression, but only once a definition for that crime has been adopted by an amendment to the Statute. (source)

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