Classical Age of the Ottoman Empire
Expansion continued during the first half of the reign of Suleiman I (r. 1520-1566), who conquered first Belgrade (1521) and Rhodes, before invading Hungary in 1526, defeating and killing King Louis II in the Battle of Mohács and briefly occupying Buda. Lacking a king, Hungary descended into civil war over the succession, and the Ottomans gave support to John Zápolya as a vassal prince. When their rivals the Habsburgs began to achieve the upper hand, Suleiman directly intervened by again conquering Buda and annexing it to the empire in 1541. Elsewhere, Suleiman led major campaigns against Safavid Iran, conquering Baghdad in 1534 and annexing Iraq. Ottoman rule was further extended with the incorporation of much of North Africa, the conquest of coastal Yemen in 1538, and the subsequent annexation of the interior.
Suleiman II
Suleiman II shrewdly appointed Köprülü Fazıl Mustafa Pasha as his Grand Vizier on 25 October 1689, leading to the reconquest of Belgrade in 1690. Even so, when Russia joined an alliance of European powers, the Ottomans lost the support of their Crimean allies, who were forced to defend themselves from Russian invasion. Under Köprülü's leadership, the Ottomans halted an Austrian advance into Serbia and crushed an uprising in Macedonia and Bulgaria until Köprülü Fazıl Mustafa Pasha was killed in the Battle of Slankamen by Austrian forces, two months after Suleiman II died at Edirne Palace in 1691.