Eustathios 9 was bishop of Erythrai; 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 995-XIII 486. In the lists of those present at the first and seventh sessions he is styled Εὐσταθίου ἐπισκόπου Ἐρυθρῶν: Mansi XII 995, XIII 368. Elsewhere he is styled Εὐστάθιος ἐπίσκοπος Ἐρυθρῶν: Mansi XIII 141. At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 141. His name is missing from the list of names of those who spoke at the second session and from the list of subscriptions to the statement of the faith adopted at the seventh session; the reason is probably textual error, as he is attested at the seventh session and subscribed the iconophile position at the fourth.

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