Synesios 1 was bishop of Kinna (Kibia, Nessos) in Galatia Prima; 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 995-XIII 486. In the list of those present at the first session he is styled Συνεσίου ἐπισκόπου Κίννης: Mansi XII 995. In the list of those present at the seventh session he is styled Συνεσίου ἐπισκόπου Κιβίας: Mansi XIII 368. In the list of subscriptions at the fourth session he is styled Συνέσιος ἐπίσκοπος Νήσσου: Mansi XIII 144 (his identity is proved by comparison with the names of the bishops recorded around him in the lists). Elsewhere he is styled Συνέσιος ὁ ὁσιώτατος ἐπίσκοπος Κίννης or similar: Mansi XII 1099, XIII 388 (ἐπίσκοπος Κίνης). 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 144. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 388.

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