The courts-martial were established on 28 April 1919 while the Paris Peace Conference, 1919 was ongoing. An inquiry commission was established, called the "Mazhar Inquiry Commission", which was invested with extraordinary powers of subpoena, arrest, et cetera, through which the war criminals were summoned to trial. This organization secured Ottoman documents from many provinces of the Ottoman Empire. Sultan Mehmet VI and Grand Vizier Damat Ferid Pasha, as representatives of the Ottoman Empire during the Second Constitutional Era were summoned to the Paris Peace Conference. On 11 July 1919, Damat Ferid Pasha officially confessed to massacres against the Armenians in the Ottoman Empire and was a key figure and initiator of the war crime trials held directly after World War I to condemn to death the chief perpetrators of the genocide.