Antonios 5 was bishop of Troizen; in 787 he attended the Second Council of Nikaia (the Seventh Ecumenical Council); he is not named in the list of those present at the first session (on 24 September 787) but is attested at the second and subsequent sessions, probably attending all later sessions, from 26 September to 23 November 787: Mansi XII 1099-XIII 486. In the list of those present at the seventh session he is styled Ἀντωνίου ἐπισκόπου Τροιζῆνος: Mansi XIII 369. Elsewhere he is styled Ἀντώνιος ὁ ὁσιώτατος ἐπίσκοπος Τροιζῆνος or similar: Mansi XII 1099, XIII 145, XIII 392. 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 145. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 392.

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