Mongol conqueror, ruler of all Mongol peoples from 1206. He conquered the empires of northern China 1211–15 and Khwarazm 1219–21, and invaded northern India in 1221, while his lieutenants advanced as far as the Crimea. When he died, his empire ranged from the Yellow Sea to the Black Sea; it continued to expand after his death to extend from Hungary to Korea. Genghis Khan controlled probably a larger area than any other individual in history. He was not only a great military leader, but the creator of a stable political system.