"Terrible" doesn't even begin to describe Ivan III, the mad tyrant of Russia. From his tragic childhood to his reign of terror to his failed legacy, Ivan the Terrible was one of the most disturbing monarchs in history. Wielding completely unchecked power, Ivan brought Russia to the brink of ruin—but that doesn't even scratch the surface of just how bad things got. Read on and find out how this infamous Tsar got his dark nickname.