Genghis Khan was the founder and Great Khan (emperor) of the Mongol Empire, which became the largest contiguous empire in history after his demise. He came to power by uniting many of the nomadic tribes of northeast Asia. After founding the Mongol Empire and being proclaimed Genghis Khan , he started the Mongol invasions that resulted in the conquest of most of Eurasia. He was a warrior and ruler. starting from obscure and insignificant beginnings, brought all the nomadic tribes of Mongolia under the rule of himself and his family in a rigidly disciplined military state.