Where did Suleiman I reign?
Territorial evolution of the Ottoman Empire
Suleiman I ( "Süleymān", ; almost always "Kanuni Sultan Süleyman") (6 November 1494  – 5/6/7 September 1566), was the tenth and longest-reigning Sultan of the Ottoman Empire, from 1520 to his death in 1566. Suleiman became a prominent monarch of 16th century Europe. Suleiman personally led Ottoman armies to conquer the Christian strongholds of Belgrade, Rhodes, and most of Hungary. In 1541 he annexed central Hungary while Transylvania became an Ottoman vassal. However rest of the Kingdom of Hungary including western and northern (Upper) Hungary and Croatia still were Habsburgs possessions. Suleiman also conquered Iraq in his conflict with the Safavid dynasty. Under his rule, the Ottoman fleet dominated the seas from the Mediterranean to the Red Sea and the Persian Gulf.
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.