Laurentios 1 was bishop of the Apsetianoi (Apsartianoi, Apsaretianoi); 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 787: he was probably 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 Λαυρεντίου ἐπισκόπου τῆς Ἀψετιανῶν ἐκκλησίας: Mansi XIII 368 (the Latin version, at XIII 367, calls his see: "Apsetianensium ecclesiae"). Elsewhere he is styled Λαυρέντιος ἐπίσκοπος τῆς ἁγίας Ἀψαρητιανῶν ἐκκλησίας, Mansi XIII 141 (Latin version, at XIII 142: "sanctae Apsaretianensium ecclesiae"); and Λαυρέντιος ἁμαρτωλὸς ἐπίσκοπος τῆς ἁγίας Ἀψαρτιανῶν ἐκκλησίας, Mansi XIII 388 (Latin version, at XIII 387, "sanctae Absartianensis ecclesiae"). The identity of his see is uncertain; possibly Apsyrtos (Apsaros) (on the Black Sea coast, east of Trebizond). 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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