Gregorios 37 was bishop of Temenothyrai in Phrygia Pacatiana; 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 Τιμενουθήρων: Mansi XII 998, XIII 372. Elsewhere he is styled Γρηγόριος ὁ ὁσιώτατος ἐπίσκοπος Τιμενουθήρων or similar: Mansi XII 1106, XIII 396. His name is missing from the Greek list of names from the fourth session but is preserved in the Latin: Mansi XIII 147 ("Gregorius episcopus Timenutensium"). 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 1106. At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 147. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 396.

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