Conference of Ambassadors in the context of "Locarno Treaties"

The Protocol of Corfu (Greek: Πρωτόκολλο της Κέρκυρας, Albanian: Protokolli i Korfuzit), signed on 17 May 1914, was an agreement between the representatives of the Albanian Government and the Provisional Government of Northern Epirus, which officially recognized the area of Northern Epirus as an autonomous self-governing region under the sovereignty of the prince of the newly established Principality of Albania. The agreement granted the Greeks of the districts of Korytsa (Korçë) and Argyrokastro (Gjirokastër), which form Northern Epirus, wider religious, educational, cultural and political autonomy, inside the borders of the Albanian state.

After the end of the Balkan Wars (1912–1913), the subsequent peace treaties ceded the region to Albania. This turn of events catalyzed an uprising among the local Greeks, which led to the Northern Epirote Declaration of Independence, on 28 February 1914. The International Commission of Control, an organization responsible for securing peace and stability in the region, eventually intervened and the Protocol of Corfu was signed on 17 May 1914. However the protocol's terms were never fully implemented because of the politically unstable situation in Albania following the outbreak of World War I, and it was eventually annulled in 1921 during the Conference of Ambassadors.

Yugoslavia (/ˌjuːɡoʊˈslɑːviə/; lit. 'Land of the South Slavs') was a country in Central Europe and the Balkans that existed from 1918 to 2003. It came into existence following World War I, under the name of the Kingdom of Serbs, Croats and Slovenes, from the merger of the Kingdom of Serbia with the provisional State of Slovenes, Croats and Serbs, and constituted the first union of South Slavic peoples as a sovereign state, following centuries of foreign rule over the region under the Ottoman Empire and the Habsburg monarchy.

Under the rule of the House of Karađorđević, the kingdom gained international recognition on 13 July 1922 at the Conference of Ambassadors in Paris and was renamed the Kingdom of Yugoslavia on 3 October 1929. Peter I was the country's first sovereign. Upon his father's death in 1921, Alexander I went on to rule the country through an extended period of political crisis that culminated in the 6 January Dictatorship and, ultimately, his assassination in 1934. Prince Paul headed the state as a prince regent until Alexander's son Peter II was declared of-age, which happened following the Yugoslav coup d'état in March 1941. Alexander I was the longest reigning of the three Yugoslav monarchs.

The Corfu incident (Greek: κατάληψη της Κέρκυρας, romanized: Katalipsi tis Kerkyras, Italian: crisi di Corfù) was a 1923 diplomatic and military crisis between Greece and Italy. It was triggered when Enrico Tellini, an Italian general heading a commission to resolve a border dispute between Albania and Greece, was murdered in Greek territory along with two other officers of his staff. In response, Benito Mussolini issued an ultimatum to Greece and, when it was not accepted in whole, dispatched forces to bombard and occupy Corfu. Mussolini defied the League of Nations and stated Italy would leave if it arbitrated in the crisis, and the Conference of Ambassadors instead eventually tendered an agreement favouring Italy. This was an early demonstration of the League's weakness when dealing with larger powers.

The Supreme War Council was a central command based in Versailles that coordinated the military strategy of the principal Allies of World War I: Britain, France, Italy, the United States, and Japan. It was founded in 1917 after the Russian Revolution and with Russia's withdrawal as an ally imminent. The council served as a second source of advice for civilian leadership, a forum for preliminary discussions of potential armistice terms, later for peace treaty settlement conditions, and it was succeeded by the Conference of Ambassadors in 1920.

The Polish–Lithuanian War was an undeclared war fought in the aftermath of World War I between newly independent Lithuania and Poland, with fighting mainly in the Vilnius and Suwałki regions, which was part of the Lithuanian Wars of Independence and lasted from May 1919 to 29 November 1920. From the spring of 1920 onward, the conflict happened alongside the wider Polish–Soviet War and was affected by its progress. It was subject to unsuccessful international mediation at the Conference of Ambassadors and the League of Nations.

After World War I, the military and political situation in the region was chaotic, as multiple countries, notably Lithuania, Poland, and Soviet Russia, vied with each other over control of overlapping areas. The Polish–Lithuanian conflict was centered on Vilnius, which the Council of Lithuania declared the capital of the restored Lithuanian state. Control of Vilnius was transferred from Germans to Poles on January 2, 1919, but the Polish paramilitary lost the city to the Bolsheviks on January 5. The Polish Army seized Vilnius again on April 19, 1919 and came in contact with the Lithuanian Army fighting in the Lithuanian–Soviet War. Despite the antagonism over Vilnius, the Lithuanian and Polish armies sometimes cooperated when fighting against a common enemy, the Bolsheviks. As Lithuanian–Polish relations worsened, the Entente drew two demarcation lines in hopes to stall further hostilities. The lines did not please either side and were ignored. The first clashes between Polish and Lithuanian soldiers occurred on April 26 and May 8, 1919, near Vievis. With the Polish coup against the Lithuanian government failing in August 1919, the front stabilized until the summer of 1920.