Suleiman the Magnificent
At the time of Suleiman's death, the Ottoman Empire was one of the world's foremost powers. Suleiman's conquests had brought under the control of the Empire major Muslim cities (such as Baghdad), many Balkan provinces (reaching present day Croatia and Hungary), and most of North Africa. His expansion into Europe had given the Ottoman Turks a powerful presence in the European balance of power. Indeed, such was the perceived threat of the Ottoman Empire under the reign of Suleiman that Austria's ambassador Busbecq warned of Europe's imminent conquest: "On [the Turks'] side are the resources of a mighty empire, strength unimpaired, habituation to victory, endurance of toil, unity, discipline, frugality and watchfulness ... Can we doubt what the result will be? ... When the Turks have settled with Persia, they will fly at our throats supported by the might of the whole East; how unprepared we are I dare not say." Suleiman's legacy was not, however, merely in the military field. The French traveler Jean de Thévenot bears witness a century later to the "strong agricultural base of the country, the well being of the peasantry, the abundance of staple foods and the pre-eminence of organization in Suleiman's government".
Safavid dynasty
Humayun was not the only royal figure to seek refuge at Tahmasp's court. A dispute arose in the Ottoman Empire over who was to succeed the aged Suleiman the Magnificent. Suleiman's favourite wife, Hürrem Sultan, was eager for her son, Selim, to become the next sultan. But Selim was an alcoholic and Hürrem's other son, Bayezid, had shown far greater military ability. The two princes quarrelled and eventually Bayezid rebelled against his father. His letter of remorse never reached Suleiman, and he was forced to flee abroad to avoid execution. In 1559 Bayezid arrived in Iran where Tahmasp gave him a warm welcome. Suleiman was eager to negotiate his son's return, but Tahmasp rejected his promises and threats until, in 1561, Suleiman compromised with him. In September of that year, Tahmasp and Bayezid were enjoying a banquet at Tabriz when Tahmasp suddenly pretended he had received news that the Ottoman prince was engaged in a plot against his life. An angry mob gathered and Tahmasp had Bayezid put into custody, alleging it was for his own safety. Tahmasp then handed the prince over to the Ottoman ambassador. Shortly afterwards, Bayezid was killed by agents sent by his own father.