Genghis Khan: Emperor of All Men

"Eight hundred or so years ago, a man almost conquered the earth. He made himself master of half the known world and inspired humankind with a fear that lasted for generations. Genghis Khan, meaning universal ruler, was a man difficult to measure by ordinary standards. When he marched with his army, it was by degrees of latitude and longitude instead of miles; cities in his path were often obliterated and rivers diverted from their courses; deserts were populated with the fleeing and dying, and after he had passed, wolves and ravens were often the sole living things in a once populous area."—Google Books