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.
List of campaigns of Suleiman the Magnificent
In January 1566 Suleiman, who had ruled the Ottoman Empire for 46 years, went to war for the last time. Although he was 72 years old and suffered gout to the extent that he was carried on a litter, he nominally commanded his thirteenth military campaign. On 1 May 1566, the Sultan left Constantinople at the head of one of the largest armies he had ever commanded. Nikola Šubić Zrinski's success in an attack upon an Ottoman encampment at Siklós, and as a consequence Suleiman's siege of Szigetvár, blocked Ottoman's line of advance towards Vienna. Although an Ottoman victory, the battle stopped the Ottoman push for Vienna that year, since Suleiman died during the siege.