Konstantinos 61 was bishop of Akrasos in Lydia; in 787 he attended the Second Council of Nikaia (the Seventh Ecumenical Council) and is attested at the fourth and seventh sessions; he perhaps attended the last five sessions, from 1 October to 23 November 787: Mansi XIII 144-486. In the list of those present at the seventh session he is styled Κώνστα (sic) ἐπισκόπου Ἀκρασοῦ: Mansi XIII 369 (the Latin version, at XIII 370, reads "Constantino episcopo Acrasi"). Elsewhere he is styled Κωνσταντῖνος ἐπίσκοπος Ἀκρασοῦ: Mansi XIII 144. At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 144. 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 attended that session and the omission is perhaps due to a defect in the text.

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