Stephanos 33 was bishop of Bibona (Vibo Hipponium, in Bruttium); 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 994-XIII 486. In the lists of those present at the first and seventh sessions he is styled Στεφάνου ἐπισκόπου Βιβόνων (Κιβώνων at XIII 365): Mansi XII 994, XIII 365. Elsewhere he is styled Στέφανος ὁ ὁσιώτατος ἐπίσκοπος Βιβόνων or similar: Mansi XII 1095 (Βιβόντων marg. Βιβόνων), XIII 140, XIII 384. At the second session he spoke in favour of the traditional veneration of icons as described in statements from pope Hadrian I (Hadrianos 1) and condemned iconoclasts: Mansi XII 1095. At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 140. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 384.

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