Zacharias 9 was bishop of Trapezopolis, in Phrygia Pacatiana; in 787 he attended the Second Council of Nikaia (the Seventh Ecumenical Council) and was probably present at the last seven sessions, from 26 September to 23 November 787: Mansi XII 1110-XIII 486 (he is not recorded in the list of names of those present at the first session, on 24 September 787). In the list of names of those present at the seventh session he is styled Ζαχαρίου ἐπισκόπου Τραπεζουπόλεως: Mansi XIII 372. Elsewhere he is styled Ζαχαρίας ὁ ὁσιώτατος ἐπίσκοπος Τραπεζοπόλεως or similar: Mansi XII 1110, XIII 148, XIII 393. 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 1110. At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 148. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 393.

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