Genghis Khan is a legendary and highly regarded figure in Mongolia, where he is seen as the father of the Mongol nation. On the other hand, he and his successors were responsible for wars of military aggression, large-scale conquest and the creation of one of the largest empires in the history of mankind. As a result, in many areas of southwestern Asia, the Middle East, and Europe, Genghis Khan is seen as a ruthless conqueror though this might be primarily because most of the history about the Mongols and Genghis Khan was written by historians from nations that were defeated and ruled by the Mongols.
Before becoming a Khan, Temüjin united many of the nomadic tribes of north-east Asia and Central Asia under a new social identity as the "Mongols." Starting with the invasion of western Xia and Jin Dynasty in northern China and consolidating through numerous conquests including the Khwarezmid Empire in Persia, Mongol rule across the Eurasian landmass radically altered the demography and geopolitics of these areas. The Mongol Empire ended up ruling, or at least briefly conquering and/or invading large parts of East Asia, Central Asia, Northern Asia, Middle East and Eastern Europe and attacking places as far as Central Europe and Southeast Asia.

