Galatios 1 was bishop of Melos; in 787 he attended the Second Council of Nikaia (the Seventh Ecumenical Council) and is attested at the fourth and seventh sessions, on 1 October and 13 October; he perhaps attended the last five sessions, from 1 October to 23 November 787: Mansi XIII 149-486. In the list of those present at the seventh session he is styled Γαλατίου ἐπισκόπου τῆς Μήλου: Mansi XIII 372. Elsewhere he is styled Γαλάτιος ἐπίσκοπος τῆς Μήλου or similar: Mansi XIII 149, XIII 396 (called Γαλατίων, but the Latin version, at 395, has "Galatius"). At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 149. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 396.

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