Theodoros 54 was a deacon of Hagia Sophia and primikerios of the notarioi of the patriarch of Constantinople: Riedinger, p. 672, lines 20-23, p. 694, lines 8-11 (= Mansi XI 605, 616) (Θεόδωρος ὁ θεοσεβέστατος διάκονος τῆς ἐνταῦθα ἁγιωτάτης τοῦ Θεοῦ μεγάλης ἐκκλησίας καὶ πριμμικήριος τῶν θεοσεβεστάτων νοταρίων τοῦ ἁγιωτάτου ἀρχιεπισκόπου τῆς θεοφυλάκτου ταύτης καὶ βασιλίδος πόλεως Γεωργίου or similar). He became archdeacon during the Council; see below. On 26 April 681 he opened the fifteenth session of the Third Council of Constantinople (the Sixth Ecumenical Council), reminding the Council that the bishop of Prousias, Domitios 1, had requested that Polychronios 3 be summoned to defend his faith before the Council and reporting that Polychronios was waiting at the entrance if required: Riedinger, pp. 672-674 (= Mansi XI 605). He opened the sixteenth session on August 9 by announcing the presence of a priest from Apamea, Konstantinos 25, with something to say relevant to the present doctrinal dispute: Riedinger, p. 694 (= Mansi XI 616-617). At the opening of the seventeenth session on 11 September he was still a deacon, but by the eighteenth he had become an archdeacon: Riedinger, p. 711, lines 28-30 (= Mansi XI 624) (at the seventeenth session: "diaconus huius sanctissimae dei catholicae et apostolicae magnae ecclesiae et primicerius deo amabilium notariorum uenerabilis atque sanctissimi Georgii archiepiscopi a deo conseruandae huius regiae urbis"; the text is extant in Latin only), Riedinger, p. 764, line 25 (= Mansi XI 629) (at the eighteenth session: ὁ θεοσεβέστατος ἀρχιδιάκονος, etc., similar to the text cited above). At the opening of the seventeenth session he recalled the decision of the Council that enough discussion had taken place and the time had now come to draw up a statement of the faith: Riedinger, pp. 712-713 (= Mansi XI 624). He opened the eighteenth and final session with an address to the emperor praising his piety and devotion to religious as well as secular affairs and declaring that after long labours the Council had agreed a definition of the faith which was now ready to be presented to the emperor: Riedinger, pp. 764-766 (= Mansi XI 629-632).

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