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Suleiman I (Ottoman Turkish: سليمان اوّل) was the tenth and longest-reigning Sultan of the Ottoman Empire, from 1520 to his death in 1566. He is known in the West as Suleiman the Magnificent and in the East, as the Lawgiver (Turkish: Kanuni; Arabic: القانونى‎, al‐Qānūnī), for his complete reconstruction of the Ottoman legal system. Suleiman became a prominent monarch of 16th century Europe, presiding over the apex of the Ottoman Empire's military, political and economic power. Suleiman personally led Ottoman armies to conquer the Christian strongholds of Belgrade, Rhodes, and most of Hungary before his conquests were checked at the Siege of Vienna in 1529. He annexed most of the Middle East in his conflict with the Safavids and large swathes of North Africa as far west as Algeria. Under his rule, the Ottoman fleet dominated the seas from the Mediterranean to the Red Sea and the Persian Gulf.

At the helm of an expanding empire, Suleiman personally instituted legislative changes relating to society, education, taxation, and criminal law. His canonical law (or the Kanuns) fixed the form of the empire for centuries after his death. Not only was Suleiman a distinguished poet and goldsmith in his own right; he also became a great patron of culture, overseeing the golden age of the Ottoman Empire's artistic, literary and architectural development. He spoke six languages: Ottoman Turkish, Arabic, Serbian, Chagatai (a dialect of Turkish language and related to Uighur), Persian and Urdu.

In a break with Ottoman tradition, Suleiman married a harem girl, Roxelana, who became Hürrem Sultan; her intrigues as queen in the court and power over the Sultan made her quite renowned. Their son, Selim II, succeeded Suleiman following his death in 1566 after 46 years of rule.