The Convention Concerning the Exchange of Greek and Turkish Populations was an agreement between the Greek and Turkish governments signed in Lausanne on 30 January 1923, in the aftermath of the Greco-Turkish War of 1919–1922. The agreement provided for the simultaneous expulsion of Orthodox Christians from Turkey to Greece and of Muslims from Greece (particularly from the north of the country) to Turkey. The population transfers involved approximately two million people, around 1.5 million Anatolian Greeks and 500,000 Muslims in Greece.