Over centuries and around the world, there is a long history of ruthless people who have wreaked havoc to get what they want. Whether empire-building or simply displaying a cruel streak, is there any excuse for the actions of people who have been responsible for the deaths of so many? Find out in these sixteen biographies of men and women throughout history who have left there deadly mark on history. From Attila the Hun and Vlad the Impaler to Adolf Hitler, readers will learn the wicked origins of the world's most dangerous people.