 After the defeat of the Ottoman Empire during World War I, the Allies granted Greece, with the Treaty of Sèvres, the administration of Eastern Thrace (apart from Constantinople) and the city of Smyrna and its environs.The Pontic Greeks attempted to establish their own republic, the Republic of Pontus.The defeat of the Greek army during the Greco-Turkish War led to what became known in Greece as the Asia Minor Catastrophe.