Theophylaktos 26 was bishop of Mossyna in Phrygia Pacatiana; in 787 he attended the Second Council of Nikaia (the Seventh Ecumenical Council) and is attested at the fourth and seventh sessions, on 1 October and 13 October 787; he was perhaps present at the last five sessions, from 1 October to 23 November 787: Mansi XIII 149-486. In the list of those present at the seventh session he is styled Θεοφυλάκτου ἐπισκόπου Μοσήνων: Mansi XIII 373. Elsewhere he is styled Θεοφύλακτος ἐπίσκοπος Μωσήνων or similar: Mansi XIII 149, XIII 397 (Μοσήνων). At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 149. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 397.

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