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.
Haseki sultan
The title was first used in the 16th century for Hürrem Sultan, also known as Roxelana, when she was given favor by Suleiman the Magnificent. She was his chief consort and the mother of Selim II. Hürrem Sultan was married to Sultan Suleiman, becoming both his legal wife and one of the most powerful women in the Ottoman Empire. The title was next held by Nurbanu Sultan, favourite wife of Selim II, and the mother of the next Sultan Murad III. In 1575, just after Murad's accession, Safiye Sultan became the haseki and was given a higher rank than the sultan's own sisters, Ismihan Sultan, Gevherhan Sultan and Şah Sultan, and his aunt Mihrimah Sultan.