A priest, Gregorios 44 was hegoumenos of the monastery of Hyakinthos; in 787 he attended the Second Council of Nikaia (the Seventh Ecumenical Council), where he is attested at the second, fourth and fifth sessions, on 26 September, 1 October and 4 October 787: Mansi XII 1111, XIII 152, XIII 189. He is styled Γρηγόριος ὁ θεοφιλέστατος πρεσβύτερος καὶ ἡγούμενος μονῆς τῶν Ὑακίνθου: Mansi XIII 189. Elsewhere he is styled Γρηγόριος ἡγούμενος τῶν Ὑακίνθου: Mansi XII 1111, XIII 152. At the second session he supported the traditional veneration of icons as described in statements from pope Hadrian I (Hadrianos 1): Mansi XII 1111. At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 152. At the fifth session he produced an undamaged copy of the Ecclesiastical History of Evagrius, from which a passage was then read out (see Stephanos 48): Mansi XIII 189.

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