8. Gilles De Rais
The man to take our first position is Gilles De Rais. It is really shocking as this man was a military before turning himself to one of the fierce serial killers. He was born in 1404; he raped, killed and tortured hundreds of people. He mutilated and even ejaculated on the dying bodies. This man was really brutal and his actions are still unmatched up to date.