Lateran Treaty
Negotiations for the settlement of the Roman Question began in 1926 between the government of Italy and the Holy See, and culminated in the agreements of the Lateran Pacts, signed—the Treaty says—for King Victor Emmanuel III of Italy by Benito Mussolini, Prime Minister and Head of Government, and for Pope Pius XI by Pietro Gasparri, Cardinal Secretary of State, on 11 February 1929. It was ratified on 7 June 1929. The agreements were signed in the Lateran Palace, hence the name by which they are known.
Treaty of Lausanne
Negotiations were undertaken during the Conference of Lausanne, where İsmet İnönü was the chief negotiator for Turkey. Lord Curzon, the British Foreign Secretary of that time, was the chief negotiator for the Allies, while Eleftherios Venizelos negotiated on behalf of Greece. The negotiations took many months. On 20 November 1922, the peace conference was opened and after strenuous debate was interrupted by Turkish protest on 4 February 1923. After reopening on 23 April, and following more protests by the Turks and tense debates, the treaty was signed on 24 July as a result of eight months of arduous negotiation. The Allied delegation included U.S. Admiral Mark L. Bristol, who served as the United States High Commissioner and championed Turkish efforts.