"Evil--the infliction of pain upon sentient beings--is one of the most long-standing and serious problems of human existence. Frequently and in many cultures evil has been personified. This book is a history of the personification of evil, which for the sake of clarity I have called 'the Devil.' I am a medievalist, but when I began some years ago to work with the concept of the Devil in the eleventh and twelfth centuries, I came to see that I could...