Epiphanios 4 was bishop of Miletos (in Caria); in 787 he attended the Second Council of Nikaia (the Seventh Ecumenical Council) and was probably present at all eight sessions, from 24 September 787 to 23 November 787: Mansi XII 994-XIII 486. In the lists of those present at the first and seventh sessions he is styled Ἐπιφανίου ἐπισκόπου Μιλήτου: Mansi XII 994, XIII 368. Elsewhere he is styled Ἐπιφάνιος ὁ ὁσιώτατος ἐπίσκοπος Μιλήτου or similar: Mansi XII 1095, XIII 140, 385 (where his see is wrongly given as Μελιτηνῆς). 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 1095. At the fourth session he subscribed the statements read out from the Fathers in support of icon veneration: Mansi XIII 140. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 385.

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