(MARINUS I), Pope, was born at Montefiascone, in the Papal States. He was thrice sent to Constantinople (866, 868, 881) as papal legate to oppose the nomination of Photius as patriarch, but when he was elected pope, Dec. 23, 882, did not continue in the policy of his predecessor, John VIII, but reversed the condemnation of Photius, of bishop Formosus of Porto and others. His reign lasted only fourteen months. He died Feb. 14, 884. See Fleury, Hist. Eccl. 3:542; F. Pagi, Breviarium Pontificumn Romanorum, etc.; Muratori, Ann. Ital.; Artaud de Montor, Hist. des souverains Pontifes Rosatinss, 2:141; Bower, Hist. Popes, v. 101 sq.; Riddle, Hist. Papacy, 2:32; Hoefer, Nouv. Biog. Generale, 34:18; Herzog, Real-Encyklop die, 9:124.