How did the anti-pope Hippolytus become a Catholic saint?
The fact that Hippolytus was a schismatic Bishop of Rome and yet was held in high honour afterwards both as martyr and theologian, explains why as early as the fourth century nothing was known as to his see, for he was not on the list of the Roman bishops. The theory championed by Lightfoot (see below), that he was actually Bishop of Porto but with his official residence in Rome, is untenable. This statement, made by a few authorities, results from a confusion with a martyr of Porto, due perhaps to a legendary account of his martyrdom. Moreover De Rossi’s hypothesis, based on the inscription by Damasus, that Hippolytus returned from exile, and subsequently became an adherent of Novatian, his reconciliation with the Roman Church not being effected until just before his martyrdom under the Emperor Valerian (253-60), is incompatible with the supposition that he is the author of the “Philosophumena.” The feast of St. Hippolytus is kept on 13 August, a date assigned in accordance with the l
