Why did Greece change the version of 18 15 in 1829? Was Greece not controlled by the Ottoman Turkish Empire at that time?

18 15 The Vienna Peace Treaty was reached by major European countries at the Vienna Conference after the Napoleonic Wars. The purpose of this peace treaty is to restore the political and territorial order in Europe before Napoleon's rule, and to re-divide and adjust the borders and relations between countries.

Greece was indeed under the rule of the Ottoman Turkish Empire for a long time before its independence in 1829. The Greek people struggled for national independence for a long time. Finally, in 1829, Greece successfully broke away from the Ottoman Turkish Empire.

As for why Greek independence changed the territory defined by the 18 15 Vienna Peace Treaty, it was mainly because Greek independence broke the European political and territorial order established by the Vienna Peace Treaty. The Vienna Peace Treaty was reached without considering the principles of nationalism and national self-determination, and the independence of Greece was achieved on the basis of these principles. Therefore, the independence of Greece can be regarded as a challenge and change to the European order established by the Vienna Peace Treaty.

Although the Ottoman Turkish Empire did not participate in the Vienna Peace Treaty, Greece was a part of its territory. Therefore, the independence of Greece not only means that the Ottoman Turkish Empire has been cut in Europe, but also means that the political and territorial order in Europe has undergone major changes. This change had a far-reaching impact on European international relations at that time, and also laid the foundation for the later European nationalist movement and the development of international political structure.