Leo 44 was bishop of Dokimion in Phrygia Salutaris; 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 (he is not attested at the first session on 24 September 787): Mansi XII 1107-XIII 486. In the list of those present at the seventh session he is styled Λέοντος ἐπισκόπου τοῦ Δοκιμίου: Mansi XIII 372. Elsewhere he is styled Λέων ὁ ὁσιώτατος ἐπίσκοπος τοῦ Δοκιμίου or similar: Mansi XII 1107 (Δοκιμείου), XIII 148, XIII 396. 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 1107. At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 148. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 396.

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