Nikolaos 10 was bishop of Hierapolis in Phrygia Pacatiana; in 787 he attended the Second Council of Nikaia (the Seventh Ecumenical Council). A former iconoclast, he was brought before the first session of the Council, on 24 September 787, with fellow bishops and iconoclasts, for examination to determine if as former heretics they could be readmitted to communion: Mansi XII 1015. They had all taken part in the disruption of the Council summoned at Constantinople in the previous year: Mansi XII 1015-1018. See further Hypatios 1. At the end of the session he and the others read out their statements of repentance accepting the traditional veneration of icons, all identical with the statement previously read out by the bishop of Ankyra, Basilios 21; the decision whether to readmit them was then postponed to a later session: Mansi XII 1050. At the third session, on 28 September 787, after further discussion Nikolaos 10 and the others were readmitted and allowed to take their seats: Mansi XII 1119. Later in this session he accepted as orthodox statements of the faith contained in letters from Tarasios 1 and eastern patriarchs and also condemned iconoclasts: Mansi XII 1154. He is styled Νικόλαος ὁ εὐλαβέστατος ἐπίσκοπος Ἱεραπόλεως or similar: Mansi XII 1015, XII 1050, XII 1119, XII 1154. He is attested at the fourth and seventh sessions, on 1 October and 13 October 787, and was probably present at the last six sessions, from 28 September to 23 November 787: Mansi XII 1119-XIII 486. In the list of those present at the seventh session he is styled Νικολάου ἐπισκόπου Ἱεραπόλεως τῆς Φρυγῶν ἐπαρχίας: Mansi XIII 365. Elsewhere he is styled Νικόλαος ἀνάξιος ἐπίσκοπος Ἱεραπόλεως τῆς Φρυγῶν ἐπαρχίας, Mansi XIII 137; Νικόλαος ἀνάξιος ἐπίσκοπος Ἱεραπόλεως, Mansi XIII 384. In the lists he appears among the metropolitan bishops; his see was therefore the metropolitan see of Hierapolis in Phrygia Pacatiana, not the non-metropolitan see of Hierapolis in Phrygia Salutaris; cf. Michael 18. At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 137. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 384.

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