Leo 33 was bishop of Troas in Hellespontos; 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 and seventh sessions he is styled Λέοντος ἐπισκόπου Τρωάδων: Mansi XII 995, XIII 369. Elsewhere he is styled Λέων ὁ ὁσιώτατος ἐπίσκοπος Τρωάδων or similar: Mansi XII 1102, XIII 144. 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 XIII 144. His name is missing from the list of those who subscribed the statement of the faith adopted by the Council at the seventh session, but he was present and the omission is perhaps an error in the text.

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