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A monument of importance is the large fragment of a marble statue of the saint discovered in 1551 which underwent restoration (the upper part of the body and the head being new), and is now preserved in the Lateran museum; the paschal cycle computed by Hippolytus and a list of his writings are engraved on the sides of the chair on which the figure of Hippolytus is seated; the monument dates from the third century.<ref>Kraus, "Realencyklopädie der christlichen Altertumer", 661 sqq.</ref>

A monument of importance is the large fragment of a marble statue of the saint discovered in 1551 which underwent restoration (the upper part of the body and the head being new), and is now preserved in the Lateran museum; the paschal cycle computed by Hippolytus and a list of his writings are engraved on the sides of the chair on which the figure of Hippolytus is seated; the monument dates from the third century.<ref>Kraus, "Realencyklopädie der christlichen Altertumer", 661 sqq.</ref>

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 Dr. Lightfoot, that he was actually Bishop of Porto but with his official residence in Rome, is untenable. This assertion, 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 fact that Hippolytus was a schismatic Bishop of Rome and yet was held in high honor afterward 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 Dr. Lightfoot, that he was actually Bishop of Porto but with his official residence in Rome, is untenable. This assertion, 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, bishop and martyr]] is kept on 13 August, a date assigned in accordance with the legend of St. Laurence; that of Hippolytus of Porto is celebrated on 22 August.

The feast of St. [[Hippolytus, bishop and martyr]] is kept on 13 August, a date assigned in accordance with the legend of St. Laurence; that of Hippolytus of Porto is celebrated on 22 August.