The signing of the Treaty of Versailles, on 28 June 1919, in the Hall of Mirrors, represented a kind of apotheosis. It was followed by the Treaty of Saint-Germain-en-Laye with Austria, the Treaty of Neuilly-sur-Seine with Bulgaria, then the Treaty of Trianon with Hungary and the Treaty of Sèvres with Turkey, itself revised in the Treaty of Lausanne of 1923. The emissaries were Hermann Muller and Johannes Bell sign the Treaty of Versailles that would bring the First World War to an end. Several factors explain the violence of the post-war period, namely, the repercussions of the Russian Revolution in 1917 in Russia and other countries, and the frustrations born of defeat. The forced transfer of populations between Greece and Turkey, undertaken under the auspices of the League of Nations in 1923, was the most dramatic consequence of the ethnic violence that broke out inthe immediate post-war period.