Konstantinos 64 was bishop of Adriana in Pamphylia; in 787 he attended the Second Council of Nikaia (the Seventh Ecumenical Council) and was probably present at the last seven sessions, from 26 September to 23 November 787 (he is not attested at the first session): Mansi XII 1111-XIII 486. In the list of those present at the seventh session he is styled Κώνστα (sic) ἐπισκόπου Ἀδριανῆς: Mansi XIII 372 (the Latin version, at XIII 371, styles him: "Constantino episcopo Hadrianae"). Elsewhere he is styled Κωνσταντῖνος ὁ ὁσιώτατος ἐπίσκοπος Ἀδριανῆς or similar: Mansi XII 1111, XIII 149, XIII 396 (Κώνστας ἀνάξιος ἐπίσκοπος Ἀνδριανῆς; the Latin version, at XIII 395, repeats this). 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 1111. 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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