On 29 September 1913, 14 October 1913, and 14 November 1913, the Ottoman Empire concluded agreements on voluntary population exchange with Bulgaria, Serbia, and Greece respectively.[34] Based on negotiations in May between Eleftherios Venizelos and Galip Kemali Bey [tr], an agreement was signed on 1 July 1914 "On the mutual, voluntary exchange of Turks in Macedonia for Greeks in the provinces of Eastern Thrace and Macedonia".