Leo 38 was bishop of Troknades in Galatia Salutaris; 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 998-XIII 486. In the lists of those present at the first and seventh sessions he is styled Λέοντος ἐπισκόπου Τροκνάδων: Mansi XII 998, XIII 369 (Τρωκνάδων). Elsewhere he is styled Λέων ὁ ὁσιώτατος ἐπίσκοπος Τρωκνάδων or similar: Mansi XII 1103, XIII 145 (Τροκνάδων), XIII 392 (πόλεως Τρωκνάδων; he is called Leontios, but the Latin version, at XIII 391, has the name Leo). 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 1103. At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 145. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 392.

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