Theodoros 78 was bishop of Germe in Hellespontus; 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 Θεοδώρου ἐπισκόπου Γέρμης: Mansi XII 995, XIII 368. Elsewhere he is styled Θεόδωρος ὁ ὁσιώτατος ἐπίσκοπος Γέρμης or similar: Mansi XII 1102 (called "Theodosios"; the Latin version, at XII 1101, has "Theodorus"), XIII 144, XIII 389 (πόλεως Γέρμης). 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 1102. At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 144. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 389.

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