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.
Tahmasp I
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.