Marianos 7 was bishop of Magydos in Pamphylia; 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 999-XIII 486. In the lists of those present at the first and seventh sessions he is styled Μαριανοῦ ἐπισκόπου Μαγύδων: Mansi XII 999, XIII 372 (Μαρίνου); the Latin version, at XIII 371, has: "Mariano"). Elsewhere he is styled Μαριανὸς ὁ ὁσιώτατος ἐπίσκοπος Μαγύδων or similar: Mansi XII 1107, XIII 149 (Μαρῖνος), 396 (Μαρῖνος). 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 149. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 396.

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