Ioseph 6 was bishop of Attaleia in Lydia; in 787 he attended the Second Council of Nikaia (the Seventh Ecumenical Council) and was probably present at the last seven sessions, from 26 September to 23 November 787: Mansi XII 1102-XIII 486. He is not recorded in the list of those present at the first session on 24 October 787. In the list of those present at the seventh session he is styled Ἰωσὴφ ἐπισκόπου Ἀτταλείας: Mansi XIII 369 (the Latin version, at XIII 370, calls him "Ioannes"). Elsewhere he is styled Ἰωσὴφ ὁ ὁσιώτατος ἐπίσκοπος Ἀτταλείας or similar: Mansi XII 1102 (the Latin version, at XII 1101, gives his name as "Ioannes"), XIII 144, XIII 389. At the second session he supported the traditional veneration of icons as described in statements from pope Hadrian I (Hadrianos 1) and condemned iconoclasts: Mansi XII 1102. At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XII 144. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 389.

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