Konstantinos 47 was bishop of Zela in Helenopontus; 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 lists of those present at the first session he is styled Κωνσταντίνου ἐπισκόπου Σηλῶν: Mansi XII 998. In the list of those present at the seventh session he is styled Κώνστα ἐπισκόπου Ζηλῶν: Mansi XIII 369. Elsewhere he is styled Κωνσταντῖνος ὁ ὁσιώτατος ἐπίσκοπος Ζηλῶν, Mansi XII 998; and Κων́στας ἐπίσκοπος Ζαλῶν, Mansi XIII 145. 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 1103. At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 145. His name is missing from the list of those who subscribed the statement of the faith adopted by the Council at the seventh session, but he was present at the session and the omission is probably due to a defect in the text, a lacuna at Mansi XIII 392.

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