Oursos 1 was bishop of the Ibaritianoi (Abaritianoi); in 787 he attended the Second Council of Nikaia (the Seventh Ecumenical Council) and is attested at the fourth and the seventh sessions, on 1 October and 13 October 787; he was perhaps present at the last five sessions, from 1 October to 23 November 787: Mansi XIII 141-486. In the list of those present at the seventh session he is styled Οὔρσου ἐπισκόπου τῆς Ἰβαριτιανῶν ἐκκλησίας: Mansi XIII 368 (the Latin version, at XIII 367, calls his see: "Hibaritensium ecclesiae"). Elsewhere he is styled Οὔρσος ἐπίσκοπος τῆς ἁγίας Ἀβαριτιανῶν ἐκκλησίας or similar: Mansi XIII 141, 388 (Latin versions, at XIII 142, 387, call his see: "Avaritianensium ecclesiae"). The location of his see is not known. At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 141. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 388.

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