Konstantinos 53 was bishop of Eukarpia 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 lists of those present at the first and seventh sessions he is styled Κωνσταντίνου ἐπισκόπου Εὐκαρπίας: Mansi XII 998, XIII 372 (called Κώνστα ἐπισκόπου Εὐκαρπίας in the Greek version; the Latin, at XIII 371, reads: "Constantino episcopo Eucarpensium"). Elsewhere he is styled Κωνσταντῖνος ὁ ὁσιώτατος ἐπίσκοπος Εὐκαρπίας or similar: Mansi XII 1107, XIII 148, XIII 396 (Κώνστας ἀνάξιος ἐπίσκοπος πόλεως Εὐκαρπίας). 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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