Konstantinos 36 was bishop of Leontine (Leontium, Leontini, in Sicily); 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 994-XIII 486. In the lists of those present at the first and seventh sessions he is styled Κωνσταντίνου ἐπισκόπου Λεοντίνης: Mansi XII 994, XIII 365. Elsewhere he is styled Κωνσταντῖνος ὁ ὁσιώτατος ἐπίσκοπος Λεοντίνης or similar: Mansi XII 1095, XIII 384 (Κώνστας, with "Constans" in the Latin version, at XIII 383). In the list of subscriptions at the fourth session his name is missing from the Greek list but is preserved in the Latin version: Mansi XIII 139 ("Constantinus indignus episcopus Leontinae"). At the second session he spoke in favour of the traditional veneration of icons as described in statements from pope Hadrian I (Hadrianos 1) and condemned iconoclasts: Mansi XII 1095. At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 139. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 384.

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