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'Nasir ad-Din Mahmud I' was the sultan of Great Seljuk (1092 - 1094). He succeeded Malik Shah I as Sultan, but he did not gain control of the empire built by Malik Shah, and Alp Arslan.
During this time, successor states split from the Great Seljuk. In Anatolia Malik Shah I was succeeded by Kilij Arslan I, and in Syria by Mahmud's uncle Tutush I. The disunity within the Seljuk realms allowed for the unexpected success of the First Crusade shortly afterwards, beginning in 1096. Although a short term, Nasir ad-Din Mahmud I ruled with an iron fist.