Each of the ancient books of magic that appear in the novel has its own history and advocates on authenticity. These include: The Sworn Book of Honorius, later used by John Dee, magician to Queen Elizabeth I; the Book of Raziel, used by the twelfth century Jewish mystics Chassidei Ashkenaz; the Testament of Solomon, the biblical King of Israel; and a body of work on magic by Moses, possibly referred to in Jude 9 (ESV).
