Mauros 8 was bishop of Caesena; 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 third place; he and the priest of Ravenna, Deusdedit 5, represented the absent bishop of Ravenna, Mauros 3: Conc. Lat., p. 2, lines 11-12 (Μαύρου ἐπισκόπου Κεσίνης καὶ Δευσδέδιτ πρεσβυτέρου Ραβέννης τὸν τόπον ἀναπληρούντων Μαύρου ἐπισκόπου τῆς αὐτῆς Ραβεννησίων πόλεως), p. 3, lines 11-12 ("Mauro Cesenate episcopo et deusdedit presbitero agentes locum Mauri sanctissimi Ravennatis ecclesiae") (the first session), cf. pp. 31, 111, 177 and 247 (the Latin version only is repeated for the other sessions). At the first session he and Deusdedit 5 presented a letter from Mauros 3 explaining his absence and naming them as his representatives: Conc. Lat., p. 22, line 1 (Μαῦρος ὁ εὐλαβέστατος Κεσίνης ἐπίσκοπος), p. 23, line 1 ("Maurus Cesinae civitatis episcopus"), cf. p. 22, line 25 with p. 23, line 24, p. 24, lines 27ff. with p. 25, lines 21ff. (Mauros of Ravenna confirmed that Mauros of Caesena and the priest Deusdedit were his representatives). At the second session they proposed that the letter from Sergios bishop of Cyprus (Sergios 111) to pope Theodore (Theodoros 49), which had just been read out to the Council, should be inserted into the acts: Conc. Lat., p. 64, lines 16-18 with p. 65, lines 15-17. Mauros 8 and Deusdedit 5 subscribed the definition of the faith agreed by the Council at its fifth session, on behalf of Mauros 3: Conc. Lat., p. 390, lines 27-28 (Μαῦρος ἐπίσκοπος Κεσίνης καὶ Δεούσδεδιτ πρεσβύτερος Ραβέννης τὸν τόπον πληροῦντες Μαύρου τοῦ ἐπισκόπου τῆς αὐτῆς Ραβεννησίων πόλεως), p. 391, lines 27-28 ("Maurus Cesenatis ecclesiae episcopus et Deusdedit presbiter locum agentes Mauri sanctissimi episcopi Ravennatis ecclesiae").

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