Konstantinos 46 was bishop of Kaisareia in Bithynia; 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 lists of those present at the first and seventh sessions he is styled Κωνσταντίνου ἐπισκόπου Καισαρείας Βιθυνίας: Mansi XII 995, XIII 369 (called Κώνστα and τῆς is added between Kaisareia and Bithynia, but the Latin version, at XIII 370, gives his name as "Constantinus"). Elsewhere he is styled Κωνσταντῖνος ὁ ὁσιώτατος ἐπίσκοπος Καισαρείας Βιθυνίας or similar: Mansi XII 1102, XIII 145, XIII 389 (called Κώνστας in the Greek and "Constans" in the Latin version, at XIII 390). 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 1102. At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 145. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 389.

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