The Mamluk Sultanate (, Sulṭanat al-Mamālīk) was a medieval realm spanning Egypt, the Levant, and Hejaz. It lasted from the overthrow of the Ayyubid Dynasty until the Ottoman conquest of Egypt in 1517. Historians have traditionally broken the era of Mamlūk rule into two periods—one covering 1250–1382, the other, 1382–1517. Western historians call the former the "Baḥrī" period and the latter the "Burjī," because of the political dominance of the regiments known by these names during the respective times. The contemporary Muslim historians referred to the same divisions as the "Turkish" and "Circassian" periods, in order to call attention to the change in ethnic origin of the majority of Mamlūks.