Rise of the Ottoman Empire
The foundation and rise of the Ottoman Empire is a period of history that started with the emergence of the Ottoman principality in , and ended with the conquest of Constantinople on May 29, 1453. This period witnessed the foundation of a political entity ruled by the Ottoman Dynasty in the northwestern Anatolian region of Bithynia, and its transformation from a small principality on the Byzantine frontier into an empire spanning the Balkans and Anatolia. For this reason, this period in the empire's history has been described as the Proto-Imperial Era. Throughout most of this period, the Ottomans were merely one of many competing states in the region, and relied upon the support of local warlords and vassals to maintain control over their realm. By the middle of the fifteenth century the Ottoman sultans were able to accumulate enough personal power and authority to establish a centralized imperial state, a process which was brought to fruition by Sultan Mehmed II (r. 1451-1481). The conquest of Constantinople in 1453 is seen as the symbolic moment when the emerging Ottoman state shifted from a mere principality into an empire, marking a major turning point in its history.
Territorial evolution of the Ottoman Empire
The Treaty of Sèvres (August 10, 1920) was the peace treaty between the Ottoman Empire and Allies at the end of World War I. The Treaty of Versailles was signed with Germany before this treaty to annul the German concessions including the economic rights and enterprises. Also, France, Great Britain and Italy signed a secret "Tripartite Agreement" at the same date. The Tripartite Agreement confirmed Britain's oil and commercial concessions and turned the former German enterprises in the Ottoman Empire over to a Tripartite corporation. The open negotiations covered a period of more than fifteen months, beginning at the Paris Peace Conference. The negotiations continued at the Conference of London, and took definite shape only after the premiers' meeting at the San Remo conference in April 1920. France, Italy, and Great Britain, however, had secretly begun the partitioning of the Ottoman Empire as early as 1915. The delay was due to the fact that the powers could not come to an agreement which, in turn, hinged on the outcome of the Turkish national movement. The Treaty of Sèvres was annulled in the course of the Turkish War of Independence and the parties signed and ratified the superseding Treaty of Lausanne in 1923.
The Treaty of Lausanne (July 24, 1923) was a peace treaty signed in Lausanne, Switzerland, that settled the Anatolian and East Thracian parts of the partitioning of the Ottoman Empire by annulment of the Treaty of Sèvres (1920) that was signed by the Constantinople-based Ottoman government; as the consequence of the Turkish War of Independence between the Allies of World War I and the Ankara-based Grand National Assembly of Turkey (Turkish national movement) led by Mustafa Kemal Atatürk. The treaty also led to the international recognition of the sovereignty of the new Republic of Turkey as the successor state of the defunct Ottoman Empire.