The term has a long history of use both in political and legal contexts. Crimes against humanity, and similar terms, were used in the 18th century and early 19th century to describe slavery and atrocities committed as part of colonialism. Its first formal use in international law was a 1915 declaration condemning the massacre of Armenians by the Turkish government. Since then the term has been used and defined in similar, but variant ways by the Nurmeberg Tribunal, Tokyo Tribunal, International Criminal Tribunal for the former Yugoslavia, International Criminal Tribunal for Rwanda, and International Criminal Court.