In 787 Petronas 4 was apo hypaton, patrikios and komes of the Opsikion (Πετρωνᾶ τοῦ πανευφήμου ἀπὸ ὑπάτων πατρικίου, καὶ κόμητος τοῦ θεοφυλάκτου βασιλικοῦ ὀψικίου); he and Ioannes 18 were the lay officials who attended the first seven sessions of the Council of Nikaia: Mansi XII 999 (the first, on 24 September 787), XII 1051 (the second, on 26 September 787), XII 1113 (the third, on 28 September 787), XIII 1 (the fourth, on 1 October 787), XIII 157 (the fifth, on 4 October 787), XIII 204 (the sixth, on 6 October 787), XIII 373 (the seventh, on 13 October 787), and cf. XIII 417 (he probably attended the eighth also, on 21 October 787). Also called Πετρωνᾶς ὁ μεγαλοπρεπέστατος πατρίκιος: Mansi XIII 160, 173. At the fifth session he commented on the severe punishment inflicted on Nebuchadnezzar for removing the cherubim from the Temple: Mansi XIII 160. He proposed that Theodosios 14 and Gregorios 38 be asked if the book containing the so-called Itineraries of the Apostles had been produced at the iconoclast Council; when the patriarch Tarasios (Tarasios 1) observed that the iconoclasts had followed their own wishes at that Council, he noted that they had acted with the approval of the emperor (κατὰ βασιλικὴν ἐπικουρίαν πάντα ἐποίουν): Mansi XIII 173. Possibly identical with Petronas 13.

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