One stock form of biography is attempting the rehabilitation or revision of a character whose reputation seems well settles. In theory, the most challenging of such projects is that of returning the Devil, otherwise known as Lucifer or Satan, from the lowest circle of human estimation to a more sympathetic or nuanced position. With a tip of the hat to Jack Miles’s God: A Biography (1995), Henry Ansgar Kelly constructs a diabolical life of sorts, retracing the idea of Satan across the centuries from ancient Israel to contemporary Catholicism. This is partly a popularising presentation of scholarly research on an idea and its variations, and partly the outworking of the attractive conceit, borrowed from Miles, that behind the pages of scriptural and apocryphal material lies the development of a real character.