Greed, genocide, political manipulation and murder most foul - these dictators would stop at nothing to make sure their names went down in history as the greatest rulers to have ever lived. Julius Caesar, Genghis Khan, Attila the Hun, Cleopatra - they are the names you know, with the facts you don't. Which of these Top 10 tyrants will fight off the competition to become the number one dictator of the ancient world?