Konstantinos 56 was bishop of Kotiaion in Phrygia Salutaris; 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 998-XIII 486. In the list of those present at the first session he is styled Κωνσταντίνου ἐπισκόπου Κοττυαείου: Mansi XII 998. In the list of those present at the seventh session he is styled Κώνστα ἐπισκόπου τοῦ Κοττυαείου: Mansi XIII 372. Elsewhere he is styled Κωνσταντῖνος ὁ ὁσιώτατος ἐπίσκοπος Κωττυαίου or similar: Mansi XII 1107, XIII 148 (τοῦ Κοττυαείου), XIII 396 (Κώνστας ἀνάξιος ἐπίσκοπος τοῦ Κοττυαείου). 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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