Bishop of Brescia, died before 397. He was one of the bishops present at a synod held in Aquileia in 381. St. Augustine met him at Milan about 383, or perhaps a little later (St. Augustine, Ep. ccxxii). He composed a catalogue of heresies (Diversarum Hereseon Liber) about 384. Among the writings of St. Gaudentius was a sermon purporting to be preached on the fourteenth anniversary of St. Philastrius's death. According to this sermon, Philastrius's life began with a great act of renunciation, for which he might fitly be compared to Abraham. Later he was ordained priest, and travelled over nearly the whole Roman world (circumambiens Universum pene ambitum Romani Orbis), preaching against pagans, Jews, and heretics, especially the Arians. Like St. Paul he carried in his body the "stigmata" of Christ, having been scourged for his zeal against the last-named heretics. At Milan he was a great stay of the Catholic party in the time of St. Ambrose's Arian predecessor. At Rome he held both private and public disputations with heretics, and converted many. His wanderings ceased when he was made Bishop of Brescia.
Doubts were first raised by Dupin as to the genuineness of this sermon, and these have been reiterated by Marx, the latest editor of Philastrius, who thinks the sermon a forgery of the eighth or ninth century. The chief objection to its genuineness, rather a weak one, seems to be that it is not found in the Manuscripts containing the undoubted sermons of St. Gaudentius. Marx was answered by Knappe, "Ist die 21 Rede des hl. Gaudentius (Oratio B. Gaudentii de Vita et Obitu B. Filastrii episcopi prædecessoris sui) echt? Zugleich ein Betrag zur Latinität des Gaudentius" (Osnabrück), who endeavours to prove the genuineness of the sermon in question by linguistic arguments. His Bollandist reviewer thinks he has made a strong case (Anal. Boll., XXVIII, 224). Philastrius's "Catalogue" of heresies would have little value, were it not for the circumstance discovered by Lipsius that for the Christian heresies up to Noetus the compiler drew from the same source as Epiphanus, i.e. the lost Syntagma of Hippolytus. By the aid, therefore, of these two and the Pseudo-Tertullian "Adv. Hær.", it has been possible in great measure to reconstruct the lost treatise of Hippolytus. The first edition of the "Catalogue" was published at Basle (1528); the latest, ed. Marx, in the Vienna "Corp. Script. Eccl. Lat." (1898).
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