An observatory was built on a hill of Maragheh. Taking over from Baiju in 1255, Hulagu established Mongol rule from Transoxiana to Syria. He destroyed the Nizari Ismaili state and the Abbasid Caliphate in 1256 and 1258 respectively. In 1258, Hulagu proclaimed himself Ilkhan (subordinate khan).
The grandson of Genghis Khan Hulagu Khan received the western provinces of the Mongol Empire. Hulagu Khan conquered Persia, eliminated the Abbasid caliphate, destroyed Baghdad ( a city of a million inhabitants), and established the Mongol empire of the Il-Khans in Persia.
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