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.
Suleiman the Magnificent
Breaking with Ottoman tradition, Suleiman married Hurrem Sultan, a woman from his harem, a Christian of Ruthenian origin who converted to Islam, and who became famous in the West by the name Roxelana, purportedly due to her red hair. Their son Selim II succeeded Suleiman following his death in 1566 after 46 years of rule. Suleiman's other potential heirs, Mehmed and Mustafa, had died; the former had died from smallpox, and the latter had been strangled to death 13 years earlier at the sultan's order. His other son Bayezid was executed in 1561 on Suleiman's orders, along with his four sons, after a rebellion. Although scholars no longer believe that the empire declined after his death, the end of Suleiman's reign is still frequently characterized as a watershed in Ottoman history. In the decades after Suleiman, the empire began to experience significant political, institutional, and economic changes, a phenomenon often referred to as the Transformation of the Ottoman Empire.