Gregorios 14 was bishop of Mitylene in Lesbos; he attended the Third Council of Constantinople (the Sixth Ecumenical Council) and is recorded as attending all eighteen sessions: Riedinger II 2. 16-825 (= Mansi XI 212-673). His see has undoubtedly dropped out of the extant list of those attending the seventeenth session (preserved only in Latin) in the Mansi edition through a scribal error; his name was directly followed by that of Georgios of Miletus (Georgios 23) in the other lists and the text here (at Mansi XI 623, line 19) should be emended to "Gregorio episcopo <Mitylenae, Georgio episcopo> Mileti". His name is preserved, however, in the lists of the seventeenth session in the Riedinger edition, II 2. 708, line 3, as "Gregorio episcopo Mylitinense". In the subscriptions to the statement of the faith, which condemned monotheletism and to the Council, he is styled Γρηγόριος ἐλέει Θεοῦ ἐπίσκοπος τῆς Μιτυληναίων πόλεως τῆς Λεσβίων νήσου: Riedinger, II 2. 784, line 26, II 2. 825, line 3, cf. 893, line 26 (= Mansi XI 645, 673, cf. 693). In the lists of those attending each session he is styled Γρηγορίου ἐπισκόπου Μιτυλήνης: Riedinger, II 2. 16, line 31, II 2. 28, line 35, etc. (= Mansi XI 212, 220, etc.). The old Latin version printed in Riedinger occasionally gives his name as Georgius, but the Greek text is unanimous for Gregorios throughout. At the eighth session (7 March 681) he declared his acceptance of the doctrine of Two Wills and Two Energies as set out in documents from pope Agatho 1 and the Roman Council: Riedinger, II 2. 200, lines 6-11 (= Mansi XI 337). He was among the signatories to the copy of the definition of the faith sent to the bishop of Rome, Agatho 1: Riedinger, II 2. 893, line 26 (= Mansi XI 693).

His name occurs in the list of bishops printed in Mansi XI 696.

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