16. Caligula
Caligula was the 3rd Roman Emperor, and he was not only merciless towards people but also animals, since it has been estimated that around 150,000 were sacrificed in the honor of the Emperor. He was also very cruel, bringing people to the point of committing suicide when they are not killed by him. He was also a sexual maniac, demanding to have a lot of women at the same time, including his own sisters.
