Sergios 17 was bishop of Bargylia (Begylia, Megylia) in Caria; 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 998-XIII 486. In the lists of those present at the first and seventh sessions he is styled Σεργίου ἐπισκόπου Βαργυλίου: Mansi XII 998 (Βεγυλίων), XIII 372. In the list of names from the second session he is styled Σέργιος ὁ ὁσιώτατος ἐπίσκοπος Μεγυλίων (sic): Mansi XII 1106 (the Latin version, at XII 1105, reads: "episcopus Megyliensium"). Elsewhere he is styled Σέργιος ἐπίσκοπος Βαργυλίων or similar: Mansi XIII 148, XIII 393 (πόλεως Βραγυλίων). 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 148. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 393.

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