The term "Atabeg" refers to a title used in the medieval Islamic world, particularly in the Seljuk Empire. It was originally given to a high-ranking official or a governor who was responsible for the education and upbringing of a young prince or ruler. Over time, Atabegs gained significant power and often ruled regions independently, acting as de facto leaders. Atabegs played a crucial role in the political landscape of the Middle East during the 11th to 13th centuries. They were instrumental in the administration of territories and the military, often leading their own armies. Notable Atabegs include Zengi and Nureddin, who were influential in the fight against the Crusaders.