Christophoros 4 was bishop of Phasis (Phasidion) and Trapezous; 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 Χριστοφόρου ἐπισκόπου Φασιδίου: Mansi XII 994 and XIII 365 (Φάσιδος). At the second session he is styled Χριστόφορος ὁ θεοφιλέστατος ἐπίσκοπος τοῦ Φάσιδος: Mansi XII 1094. At the third he is styled Χριστόφορος ὁ ὁσιώτατος ἐπίσκοπος Φάσιδος: Mansi XII 1154. At the fourth session he is styled Χριστόφορος ἀνάξιος ἐπίσκοπος τοῦ Φάσιδος ἤτοι Τραπεζοῦντος: Mansi XIII 137. At the seventh session he is styled Χριστόφορος ἀνάξιος ἐπίσκοπος Τραπεζοῦντος: Mansi XIII 384. 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 1094. At the third session he accepted as orthodox the statements of the faith contained in letters from Tarasios 1 and the eastern patriarchs and also condemned iconoclasts: Mansi XII 1154. At the fourth session 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. The sees of Phasis and Trapezous appear to have been united at this time.

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