Konstantinos 33 was bishop of Gangra; 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 994-XIII 486. In the lists of those present at the first and seventh sessions he is styled Κωνσταντίνου ἐπισκόπου Γαγγρῶν: Mansi XII 994, XIII 365. Elsewhere he is styled Κωνσταντῖνος ὁ θεοφιλέστατος ἐπίσκοπος Γαγγρῶν or similar: Mansi XII 1091, XIII 136 (wrongly called Κώνστας; the Latin version, at XIII 135, calls him "Constantinus"), XIII 381. 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 1091. At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 136. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 381. Possibly identical with Konstantinos 294.

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