Eustratios 3 was bishop of Debelton in Haemimontus; 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 1110-XIII 486. In the lists of those present at the seventh session he is styled Εὐστρατίου ἐπισκόπου Δεβελίου (sic): Mansi XIII 372 (the Latin version, at 371, calls him: Eustathio). Elsewhere he is styled Εὐστράτιος ὁ ὁσιώτατος ἐπίσκοπος Δεβελτοῦ or similar: Mansi XII 1110, XIII 149, 396. 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 1110. 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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