Martinos 3 was bishop of Gabii; he attended all five sessions of the Lateran Council, from 5 October to 31 October 649, and in the list of bishops present is named in thirty-second place: Conc. Lat., p. 4, line 4 (Μαρτίνου ἐπισκόπου Γαβήνης), p. 5, line 4 ("Martino Gavinate episcopo") (the first session), cf. pp. 31, 111, 177 and 247 (the Latin version only is repeated for the other sessions). He subscribed the definition of the faith agreed by the Council at its fifth session: Conc. Lat., p. 394, line 9 (Μαρτῖνος ἐπίσκοπος Γαβηνῆς), p. 395, line 9 ("Martinus episcopus sanctae Gabinatis ecclesiae").

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