In 1915, during the crucial phase of World War I, Venizelos, Prime Minister of Greece at the time, entered in disagreement with King Constantine over the choices of the Greek Monarch regarding matters of foreign affairs, as well as his intervention in function of the institution. In September 1915, Venizelos resigned from office. One year later, he left for Thessaloniki, where he established a Provisional Government and declared that Greece would join the war in support of the Entente. As a result, Greece had two separate governments that supported totally opposite policies, whilst society walked the path of National Schism.
The Treaty of Sèvres, signed in Paris, on July 28 / August 10, 1920, was the culmination of the diplomatic triumphs of the Greek politician.