Theodosios 14 was bishop of Amorion in Galatia; in 787 he attended the Second Council of Nikaia (the Seventh Ecumenical Council). He had apparently attended the iconoclast council of 754; see below). Formerly an iconoclast, he was admitted to the first session of the Council, on 24 September 787, in order to repent of his errors and to read out his confession; he spoke first in condemnation of his former opinions and then read his own statement of faith, accepting the veneration of icons and relics and praying for the saints and martyrs to intercede on his behalf on Judgement Day; he drew a parallel with the images of the emperors and the respect paid to them, and finally anathematised those who refused to venerate icons; he was then admitted to communion with the Church and allowed to take his place among the assembled bishops: Mansi XII 1007 and XII 1011-1015 (styled Θεοδόσιος ὁ ἐπίσκοπος τοῦ Ἀμορίου or similar). He is attested at the second, third, fourth and seventh sessions and he probably attended the last seven sessions of the Council, from 26 September to 23 November 787: Mansi XII 1098-XIII 486. In the list of those present at the seventh session he is styled Θεοδοσίου ἐπισκόπου τοῦ Ἀμορίου: Mansi XIII 368. Elsewhere he is styled Θεοδόσιος ὁ ὁσιώτατος ἐπίσκοπος τοῦ Ἀμωρίου or similar: Mansi XII 1098, XII 1154, XIII 17-20, XIII 141, XIII 173.

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 third session he accepted as orthodox the statements of the faith contained in letters from Tarasios 1 and the eastern patriarchs and condemned iconoclasts: Mansi XII 1154. At the fourth session he spoke to the patriarch accepting the teachings of the Fathers that icons were holy and anathematised those who spoke otherwise; he also observed that icons were, like the Scriptures, intended for our instruction and by following their example we could become worthy to inherit the heavenly kingdom: Mansi XIII 17-20. He and Gregorios bishop of Neokaisareia (Gregorios 38) revealed that at the iconoclast council (of 754) the documents produced had not been complete texts but pages (pittakia) (and cf. Euthymios 1): Mansi XIII 37. Later at this session he subscribed the statements read out from the Fathers in support of icon veneration: Mansi XIII 141.

At the fifth session he and Gregorios 38 of Neokaisareia confirmed that forged extracts only of the so-called Itineraries of the Apostles had been produced at the iconoclast Council: Mansi XIII 173. His name is missing from the list of those who subscribed the statement of the faith adopted by the Council at the seventh session, but he was present at the session and the omission is perhaps due to a defect in the text.

Probably identical with Theodosios, bishop of Amorion, owner of seals (two specimens survive, both are damaged but they supplement one another) dateable to the eighth century: DOSeals III 88.4 = Laurent, Corpus V 1, no. 502, Schlumberger, Sig., p. 268, no. 1 (where the name is misread as Theodoros). Obv.: cruciform monogram of uncertain type. Rev.: Θεοδ - σιω επ - σκοπω - ου Αμορ.. The name and title read: Θεοδοσίῳ ἐπισκόπῳ τοῦ Ἀμορίου.

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