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.
Mahidevran
When Selim I died in 1520, Suleiman moved to Constantinople, the capital of the Ottoman Empire, along with his family to ascend the throne. In 1521, Suleiman lost his two other sons, nine-year-old Mahmud and the toddler Murad, Mustafa became the eldest of his princely generation.
Mahidevran became Suleiman's Baş Kadın (a rank equivalent to main consort before the invention of the royal title Haseki Sultan for Hürrem Sultan). In the Istanbul harem, Mahidevran had a very influential rival, Hürrem Sultan (also known as Roxelana in Europe), who soon proved to be Suleiman's favourite.