東方問題
The Eastern Question emerged as the power of the Ottoman Empire began to decline during the 18th century. The Ottomans were at the height of their power in 1683, when they lost the Battle of Vienna to the combined forces of the Polish–Lithuanian Commonwealth and Austria, under the command of John III Sobieski. Peace was made much later, in 1699, with the Treaty of Karlowitz, which forced the Ottoman Empire to cede many of its Central European possessions, including those portions of Hungary which it had occupied. Its westward expansion arrested, the Ottoman Empire never again posed a serious threat to Austria, which became the dominant power in its region of Europe. The Eastern Question did not truly develop until the Russo-Turkish Wars of the 18th century.