34 of the Most Vicious Villains in Game of Thrones History

He's a former maester thrown out of the order for his unorthodox experiments on the human body. Upon entering Queen Cersei's employ, he replaces Lord Varys as the Master of Whisperers on the small council and eventually becomes Hand of the Queen. Yet his resurrection of the Mountain and his creation of a potential dragon-slaying weapon called the Scorpion are his most heinous acts to date.