Leo 35 was bishop of Neokaisareia and Ariste in Bithynia; 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 session he is styled Λέοντος ἐπισκόπου Ἀρίστης: Mansi XII 995. In the list of those present at the seventh session he is styled Λέοντος ἐπισκόπου Νεοκαισαρείας ἤτοι Ἀρίστης: Mansi XIII 369. Elsewhere he is styled Λέων ὁ ὁσιώτατος ἐπίσκοπος Ἀρίστης or similar: Mansi XII 1103, XIII 145 (Νεοκαισαρείας ἤτοι Ἀρίστης), XIII 389 (πόλεως Ἀρίστης). 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 icon veneration: Mansi XIII 145. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 389.

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