Ioannes 98 was bishop of Assos; 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 Ἰωάννου ἐπισκόπου Ἄσσου: Mansi XII 995. In the list of those present at the seventh session his name has disappeared though his see is recorded under a bishop Basilios (cf. Basilios 14); the text should perhaps be restored to read: Ἰωάννου ἐπισκόπου Ἄσσου: Mansi XIII 368. Elsewhere he is styled Ἰωάννης ὁ ὁσιώτατος ἐπίσκοπος Ἄσσου or similar: Mansi XII 1098, XIII 141, 385 (Ἰωάννης ἀνάξιος ἐπίσκοπος πόλεως Ἀσσῶν with no accent or breathing on Ἀσσῶν). At the second session he spoke in support of the traditional veneration of icons as described in statements from pope Hadrian I (Hadrianos 1) and condemned iconoclasts: Mansi XII 1098. At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 141. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 385.

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