Celebrated Mongol ruler. Converted to Islam and recognized it as the state religion. Ruthlessly eliminated opposition and extended his reign over all Persia. Introduced major fiscal reforms, under which the country prospered. Admired the arts and sciences and mastered several languages. At his suggestion, the famous historian Rashid al-Din (d. ca. 1182) composed Jami al-Tawarikh, a history of the Mongols.