Treaty of Adrianople

September 14, 1829

After another Russo-Turkish war, the sultan ceded the Danube delta and recognized the autonomy of Serbia, Moldavia, Wallachia, and - most consequentially - an independent Greek state. The Ottoman Empire had just lost its first European province. The Eastern Question, which would poison Europe until 1914, was open. Russia gained effective control of the Danube mouth, giving it a chokehold on southeastern Europe's trade that alarmed both Britain and Austria.