The Atheist's BibleA comprehensive biography of the Treatise of the Three Impostors, a controversial nonexistent medieval book. Like a lot of good stories, this one begins with a rumor: in 1239, Pope Gregory IX accused Frederick II, the Holy Roman Emperor, of heresy. Without disclosing evidence of any kind, Gregory announced that Frederick had written a supremely blasphemous bookDe tribus impostoribus, or the Treatise of the Three Impostorsin which Frederick denounced