Genghis Khan: Genghis Khan. Genghis Khan was the founder and first Great Khan (Emperor) of the Mongol Empire, which became the largest contiguous empire in history after his death. He came to power by uniting many of the nomadic tribes of the Mongol steppe and being proclaimed the universal ruler of the Mongols, or Genghis Khan. With the tribes of Northeast Asia largely under his control, he set in motion the Mongol...