Michael 22 was bishop of Tiberiopolis in Phrygia Pacatiana; in 787 he attended the Second Council of Nikaia (the Seventh Ecumenical Council), where he is attested only at the second and fourth sessions on 26 September and 1 October 787: Mansi XII 1110, XIII 149. At the second session he supported the traditional veneration of icons as described in statements from pope Hadrian I (Hadrianos 1) and condemned iconoclasts; he is styled Μιχαὴλ ὁ ὁσιώτατος ἐπίσκοπος Τιβεριουπόλεως: Mansi XII 1110. At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons; he is styled Μιχαὴλ ἐπίσκοπος Τιβεριουπόλεως: Mansi XIII 149. He is not named in the lists of those present at either the first or the seventh sessions.

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