Niketas 18 was bishop of Ilion in Hellespontus; 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 Νικήτα ἐπισκόπου τοῦ Ἰλέου: Mansi XII 995 (the Latin version, at XII 996, reads "episcopo Hilei"). In the list of those present at the seventh session he is styled Νείλου ἐπισκόπου Ηλαίου (sic, no breathing given): Mansi XIII 369 (the Latin version, at XIII 370, has "Niceta episcopo Helaei"). Elsewhere he is styled Νικήτας ὁ ὁσιώτατος ἐπίσκοπος τοῦ Ιλεοῦ (sic, no breathing given): XII 1102; Νικήτας ἐπίσκοπος τοῦ Υλαίου (sic, no breathing given), XIII 144; and Νεκτάριος ἀνάξιος ἐπίσκοπος τοῦ Ιλαίου (sic, no breathing given), XIII 389 (the Latin version, at XIII 390 has "Niceta indignus episcopus Ilaei"). 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. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 389.

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