Theodoros 69 was bishop of Seleukeia in Isauria (he is listed with the Isaurian bishops); 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 994-XIII 486. In the lists of those present at the first and seventh sessions he is styled Θεοδώρου ἐπισκόπου Σελευκείας: Mansi XII 994, XIII 365. Elsewhere he is styled Θεόδωρος ὁ θεοφιλέστατος ἐπίσκοπος Σελευκείας or similar: Mansi XII 1094, 1154, XIII 65, XIII 137, XIII 384. At the second session (26 September 787) he supported the traditional veneration of icons as described in statements from pope Hadrian I (Hadrianos 1) and he condemned iconoclasts: Mansi XII 1094. At the third session, on 28 September 787, he accepted as orthodox the statements of the faith in letters from Tarasios 1 and the eastern patriarchs and condemned iconoclasts: Mansi XII 1154. At the fourth session (1 October 787) he confirmed the account of a miraculous cure experienced by a neighbouring bishop, Manzon 1 of Prakana: Mansi XIII 65. Later he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 137. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 384.

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