His reign lasted only four years. Yet, as the third emperor of the Roman Empire, he remains one of the most notorious rulers in history. Best remembered for his bacchanalian lifestyle and callous, heavy-handed ruling style, Caligula packed a lot into a very short life. Discover how the first six months of Caligula's rule were marked by a surprising degree of clemency and how a violent illness seemingly transformed him into the monster he is now remembered as.