Dionysios 1 was diakonos and kankellarios in the bureau (sekreton) of the patriarch of Constantinople; at the eighth session of the Third Council of Constantinople (the Sixth Ecumenical Council) on 7 March 681, he was among those named by the bishop of Melitene, Theodoros 26, as responsible with him for a statement noting that the five previous ecumenical councils had not settled the doctrine of One Will or Two; he denied all knowledge of the document, but was told to produce a statement of the faith in order to satisfy the Council: Riedinger, p. 204, line 18 (= Mansi XI 341-345) (διάκονος καὶ καγκελλάριος; he was one of τινες τοῦ σεκρέτου τοῦ ἁγιωτάτου πατριάρχου Κωνσταντινουπόλεως). He was one of the group of suspected heretics admitted after the start of the ninth session to defend themselves; like the others he agreed to present a statement of faith: Riedinger, p. 268, lines 4-5, p. 276, line 10 (= Mansi XI 381, 385). At the tenth session they all presented identical statements, which were accepted: Riedinger, pp. 390-396 (= Mansi XI 449-455).

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