Eustratios 1 was bishop of Apamea 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 994-XIII 486. His name is given also as Eustachius (XII 1096, Latin version), Eustathius (XIII 367, Latin version; XIII 384, Greek version); elsewhere he is called Eustratios. In the lists of those present at the first and seventh sessions he is styled Εὐστρατίου ἐπισκόπου Ἀπαμείας (τῆς Βιθυνῶν ἐπαρχίας, added at XIII 368): Mansi XII 994, XIII 368. 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; he is styled Ἐυστράτιος ὁ ὁσιώτατος ἐπίσκοπος Ἀπαμείας: Mansi XII 1095. At the fourth session he subscribed to the statements read from the Fathers in support of the veneration of icons; styled Εὐστράτιος ἐπίσκοπος τῆς Βιθυνῶν ἐπαρχίας: Mansi XIII 140. At the seventh session he subscribed the statement of the faith adopted by the Council; styled Εὐστάθιος ἀνάξιος ἐπίσκοπος Ἀπαμείας: Mansi XIII 384.

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