 Hippolytus's most extensive treatment is given to the works of Pythagoras, Plato, and Aristotle.An outline of the philosophies of the Brahmins of India, Zamolxis of Thrace and the Celtic druids and also of the mythological poetry of Hesiod is given here.Book IV details and seeks to refute the various beliefs and practices of various diviners and magicians, "i.e.