Theophanes 10 was bishop of Lebedos; 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. Called "Thomas" at Mansi XIII 368 and in the Latin version, at XIII 367, which is clearly an error but the explanation is not clear. In the list of those present at the first and seventh sessions he is styled Θεοφάνους ἐπισκόπου Λεβέδων: Mansi XII 995, XIII 373 (Λεβέδου). Elsewhere he is styled Θεοφάνης ὁ ὁσιώτατος ἐπίσκοπος Λεβέδων or similar: Mansi XII 1098, XIII 141 (Λεβένδου), cf. XIII 383 (Latin version only). 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 1098. At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 141. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 383.

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