Damianos 3 was bishop of Meros in Phrygia Salutaris; in 787 he attended the Second Council of Nikaia (the Seventh Ecumenical Council) and was probably present at the last seven sessions, from 26 September to 23 November 787 (he is not attested at the first session on 24 September 787): Mansi XII 1107-XIII 486. In the list of those present at the seventh session he is styled Δαμιανοῦ ἐπισκόπου Μηροῦ: Mansi XIII 372. Elsewhere he is styled Δαμιανὸς ὁ ὁσιώτατος ἐπίσκοπος τοῦ Μήρου or similar: Mansi XII 1107, XIII 148 (Μύρου). In the list of names from the seventh session he is named but is given the wrong see in the Greek text at Mansi XIII 396 (Δαμιανὸς ἀνάξιος ἐπίσκοπος πόλεως Κιναβάρων). The text should be corrected to read: Δαμιανὸς ἀνάξιος ἐπίσκοπος τοῦ Μηροῦ ὁμοίως. The Latin version, at XIII 395, preserves the correct form: "Damianus indignus episcopus Meri". See on this passage Theophylaktos 22. At the second session he supported the traditional veneration of icons as described in statements from pope Hadrian I (Hadrianos 1), and condemned iconoclasts: Mansi XII 1107. At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 148. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 396.

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