Leo 31 was bishop of Minzos (Mnizos) in Galatia Prima; in 787 he attended the Second Council of Nikaia (the Seventh Ecumenical Council) and was probably present at all eight sessions, although not recorded in the list of names at the second session (on 26 October 787): Mansi XII 995-XIII 486. In the lists of those present at the first and seventh sessions he is styled Λέοντος ἐπισκόπου Μίνζου (sic): Mansi XII 995, XIII 368. Elsewhere he is styled Λέων ἐπίσκοπος Μίνζου (sic) or similar: Mansi XIII 144, XIII 388 (Μιζούης). At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 144. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 388. The names of Leo 31, Anthimos 3 and Spyridon 1 have perhaps fallen out of the list of names at the second session through a textual error.

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