Theognios 2 was a priest; in 787 he represented bishop Philippos 3 of Sion at 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 list of those present at the first session he is styled Θεόγνιδος τοποτηρητοῦ Σιὼν πόλεως: Mansi XII 995. In the list of those present at the seventh session he is styled Θεογνίου πρεσβυτέρου καὶ ἐκ προσώπου Σιῶν: Mansi XIII 368. Elsewhere he is styled Θεόγνιος [πρεσβύτερος ?] καὶ τοποτηρητὴς Σιὼν, Mansi XII 1099; Θεόγνιος πρεσβύτερος καὶ ἐκ προσώπου Φιλίππου ἐπισκόπου Σιὼν, XIII 141; and Θεόγνις ἀνάξιος πρεσβύτερος καὶ ἐκ προσώπου Σιὼν, XIII 385. 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 1099. At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 141. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 385.

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