Ioannes 82 was bishop of Ephesos; 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 Ἰωάννου ἐπισκόπου Ἐφέσου: Mansi XII 994, XIII 365. Elsewhere he is styled Ἰωάννης ὁ ὁσιώτατος ἐπίσκοπος Ἐφέσου or similar: Mansi XII 1087, 1147, XIII 133, 380. At the second session he supported the traditional veneration of icons as described in statements from pope Hadrian I (Hadrianos 1): Mansi XII 1087. At the third session he accepted as orthodox the statement of faith contained in the letter from the eastern patriarchs and anathematised iconoclasts: Mansi XII 1147. At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 133. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 380.

He is perhaps to be identified with Ioannes archbishop of Ephesos of whom a seal, dateable to the eighth or ninth century, survives: Laurent, Corpus V 1, no. 256 = Konstantopoulos, JIAN 6, 240. Obv.: invocative monogram of Χριστὲ βοήθει with the legend τω - σω - δου - λω. Rev.: [+][Ι]ωα - [ν]νη αρχ - [ιε]πισκ(όπῳ) Ε - [φεσου]. Another seal, dateable to the late eighth century, presumably belongs to the same person: Zacos and Veglery 2696 (the text reads: Ἰωάννου ἀρχιεπισκόπου Ἐφέσου).

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