Hypatios 1 was bishop of Nikaia in Bithynia; in 787 he attended the Second Council of Nikaia (the Seventh Ecumenical Council). A former iconoclast, he was brought before the first session of the Council, on 24 September 787, together with his fellow iconoclasts Leo 52, Gregorios 39, Leo 51, Georgios 68, Leo 53 and Nikolaos 10, for examination to determine if as former heretics they could be readmitted to communion: Mansi XII 1015. They had all taken part in the disruption of the Council summoned at Constantinople in the previous year: Mansi XII 1015-1018. Hypatios 1 is recorded as replying to questions from Tarasios 1 and others at Mansi XII 1018-1019 (blaming their heretical views on ignorance and folly and on evil teachers), XII 1031 (accepting that they had not been forced into iconoclasm but were brought up to believe in it). At the end of the session he and the others read out their statements of repentance accepting the veneration of icons, all identical with the previous statement read by the bishop of Ankyra, Basilios 21; the decision whether to readmit them was then postponed to a later session: Mansi XII 1050. After further discussion he and the others were readmitted and allowed to take their seats at the third session (28 September 787): Mansi XII 1119. Later at this session he accepted as orthodox the statement of the faith contained in the letter from the eastern patriarchs and he anathematised iconoclasts: Mansi XII 1150. He is attested at the fourth and seventh sessions, on 1 October and 13 October 787; he was probably present at the last six sessions, from 28 September to 23 November 787: Mansi XII 1119-XIII 486. In the list of those present at the seventh session he is styled Ὑπατίου ἐπισκόπου Νικαίας τῆς Βιθυνῶν ἐπαρχίας: Mansi XIII 365. Elsewhere he is styled Ὑπάτιος ἀνάξιος ἐπίσκοπος Νικαίας τῆς Βιθυνῶν ἐπαρχίας or similar: Mansi XII 1015 (the epithet is θεοφιλέστατος), XII 1019 (the epithet is εὐλαβέστατος), XII 1119 (ὅ (sc. ἐπίσκοπος) τε Νικαίας), XII 1150 (the epithet is ὁσιώτατος), XIII 136, XIII 381 (Ὑπάτιος ἀνάξιος ἐπίσκοπος Νικαίας). At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 136. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 381.

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