Genghis Khan, the Great Khan (emperor), founded the Mongol Empire, which became the largest contiguous empire in history of the world after his death. He united Mongol tribes to improve their chances in battles. He had power over more of the world than any other conqueror in history. Despite his ferocity, the areas he ruled were given freedom of religion and were allowed to use efficient trade routes. By the end of his life, the Mongol Empire had occupied a considerable part of Central Asia and China. After his death the Mongolian empire was ruled by his son, Ogedei Khan, and grandson, Kubilai Khan.
