Which 1533 treaty granted Ottoman control over most of Hungary?

The 1533 Treaty of Constantinople granted the Ottoman Empire a dominant position over most of Hungary. Signed in Constantinople on July 22, 1533, the agreement ended the Habsburg–Ottoman war of 1529–1533 and formalized a temporary political settlement.

The dispute began after the death of Hungary’s King Louis II at the Battle of Mohács in 1526. John Szapolyai and Ferdinand of Habsburg both claimed the Hungarian throne. Sultan Suleiman I supported Szapolyai, while Ferdinand was backed by his brother, Emperor Charles V. After Ottoman campaigns against Austria, Ferdinand could not establish control over the whole kingdom.

Under the treaty, Ferdinand recognized Suleiman as his “father and suzerain,” accepted the Ottoman grand vizier as his equal in rank, and agreed to pay an annual tribute. He withdrew his claims to most of Hungary, retaining only a smaller western area. Szapolyai remained king of Ottoman-backed Hungary as a vassal.

The treaty did not create a permanent final division. The Ottomans later annexed central Hungary directly, especially after campaigns in 1541 and 1543. That later development is why the 1533 settlement is sometimes confused with the Ottoman conquest of Hungary itself.