Marinos 4 was bishop of Atandros (Antandros) 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 list of those present at the first session he is styled Μαρίνου ἐπισκόπου Ἀτάνδρου: Mansi XII 995. In the Latin version of those present at the seventh session (his name is missing from the Greek version) he is styled "Mariano episcopo Atandrensium": Mansi XIII 367. Elsewhere he is styled Μαρῖνος ὁ ὁσιώτατος ἐπίσκοπος Ἀτάνδρου or similar: Mansi XII 1098, XIII 141, 388 (Μαρῖνος ἀνδάξιος ἐπίσκοπος πόλεως Ατάνδρου). The Latin versions at XII 1097, XIII 142 and XIII 387 all give his name as "Marianus" or (at XIII 387) "Maurianus". At the second session he spoke in support of 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 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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