AbstractIn 1998 the United Nations held a diplomatic conference on the establishment of an International Criminal Court in Rome. In the end of the conference the negotiating states adopted the Rome Statute by which an international criminal court was established. The court, which entered into force on 1 July 2002, has jurisdiction over the crimes of genocide, crimes against humanity and war crimes. The court also has jurisdiction over the crimes of aggression but the court will only be able to exercise its jurisdiction of this crime category when the member states of the court have found a definition of the crime.In the draft statute, which was prepared before the conference, acts of terrorism were a proposed crime. With the starting-point in the Rome conference this essay studies how the working-definition of crimes of terrorism was elaborated in the draft statute and how the state delegations viewed the crime.