Ioannes 109 was a deacon; in 787 he attended the Second Council of Nikaia (the Seventh Ecumenical Council) as representative of the see of Phaselis in Lycia; he was probably present at all eight sessions, from 24 September to 23 November 787: Mansi XII 998-XIII 486. In the list of those present at the first session he is styled Ἰωάννου διακον́ου καὶ τοποτηρητοῦ Φασήλιδος: Mansi XII 998. In the list of those present at the seventh session he is styled Ἰωάννου διακόνου καὶ ἐκ προσώπου Φασηλίδος: Mansi XIII 369. Elsewhere he is styled Ἰωάννης διάκονος καὶ τοποτηρητὴς Φασήλιδος or similar: Mansi XII 1106, XIII 145 (διάκονος καὶ ἐκ προσώπου τοῦ θρόνου Φασήλιδος), 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 1106. At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 145. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 393.

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