Gregorios 30 was bishop of Sinope in Helenopontus; 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 998-XIII 486. In the lists of those present at the first and seventh sessions he is styled Γρηγορίου ἐπισκόπου Σινώπης: Mansi XII 998, XIII 369. Elsewhere he is styled Γρηγόριος ὁ ὁσιώτατος ἐπίσκοπος Σινώπης or similar: Mansi XII 1103, XIII 145. At the second session he spoke in support of the traditional veneration of icons as described in statements from pope Hadrian I (Hadrianos 1) and he condemned iconoclasts: Mansi XII 1103. At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 145. His name is missing from the list of those who subscribed the statement of the faith adopted by the Council at the seventh session, but he was present at the session and his omission is perhaps due to a textual defect; his name is probably lost in a lacuna on Mansi XIII 392. Bishop of Sinope (Γρηγόριον, ἐπίσκοπον Σινώπης: Theoph. AM 6285); in 793 he was captured and executed by the emperor Constantine VI (Konstantinos 8) when the rebellious troops of the Armeniakoi were defeated, on 26 May 793 (on the Sunday of Pentecost): Theoph. AM 6285. He was presumably a supporter of Eirene 1 against Constantine VI (Konstantinos 8). He is probably identical with Gregorios, bishop of Sinope, who owned a seal dateable to the second half of the eighth century: Zacos and Veglery 1948 A. The name and title read: Γρηγορίῳ ἐπισκόπῳ Σινώπης. Cf. Rochow, Theophanes 259.

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