Kosmas 7 was bishop of Myrine in Asia; in 787 he attended the Second Council of Nikaia (the Seventh Ecumenical Council) and was probably present at all eight sessions, from 24 September to 23 November 787: Mansi XII 995-XIII 486. In the lists of those present at the first and seventh sessions he is styled Κοσμᾶ ἐπισκόπου Μυρρίνης: Mansi XII 995, XIII 368 (Μυρίνης). Elsewhere he is styled Κοσμᾶς ὁ ὁσιώτατος ἐπίσκοπος Μυρίνης or similar: Mansi XII 1098 (Μυένης v. line Μύρρης), XIII 141, XIII 388. 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 1098. At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 141. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 388.

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