Ioannes 86 was bishop of Arkadioupolis (in Europa); in 787 he attended the Second Council of Nikaia (the Seventh Ecumenical Council) and probably attended 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 Ἰωάννου ἐπισκόπου Ἀρκαδιουπόλεως: Mansi XII 994, XIII 368. Elsewhere he is styled Ἰωάννης ὁ ὁσιώτατος ἐπίσκοπος Ἀρκαδιουπόλεως: Mansi XII 1095, 1099, XIII 140, 384. At the second session he spoke in support of the traditional veneration of icons as described by pope Hadrian I (Hadrianos 1) and condemned iconoclasts: Mansi XII 1095, cf. XII 1099 (his name is repeated). At the fourth session he subscribed to 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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