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- Oaths - - (Catholic Encyclopedia.
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- Oaxaca - - (Catholic Encyclopedia.
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- Obba - - (Catholic Encyclopedia.
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- O'Conor, Charles - - Called "the Venerable." Eighteenth-century Irish antiquarian.
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- O'Conor, Charles - - The son of Irish immigrants, he was an eminent New York lawyer and orator. He defended Jefferson Davis and prosecuted Boss Tweed. Died 1884.
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- Octave - - (Catholic Encyclopedia.
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- Odilia, Saint - - Patroness of Alsace, d. 720, founded the convent of Hohenburg.
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- Odo, Saint - - Benedictine monk, Archbishop of Canterbury, died in 959.
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- Offa - - (Catholic Encyclopedia.
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- Ohio - - (Catholic Encyclopedia.
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- Olba - - (Catholic Encyclopedia.
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- Olenus - - (Catholic Encyclopedia.
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- Olinda - - (Catholic Encyclopedia.
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- Oliva - - (Catholic Encyclopedia.
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- Oliver Plunket, Saint - - Biographical article on the professor of theology, Archbishop of Armagh and Primate of All Ireland, martyred in 1681.
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- Olmütz - - (Catholic Encyclopedia.
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- Olympias, Saint - - Widow, deaconess, renowned for her almsgiving, and a staunch supporter of St. John Chrysostom.
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- Olympus - - (Catholic Encyclopedia.
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- Ombus - - (Catholic Encyclopedia.
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- Omer, Saint - - Swiss-born bishop of Terouenne in Belgic Gaul, founder of a monastery. He died in about 670.
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- Onias - - (Catholic Encyclopedia.
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- Ontario - - (Catholic Encyclopedia.
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- Ophir - - (Catholic Encyclopedia.
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- Oporto - - (Catholic Encyclopedia.
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- Optatus, Saint - - Fairly long essay on the life and writings of this bishop, who argued against the Donatists. He died in about 387.
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- Oracle - - (Catholic Encyclopedia.
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- Oran - - (Catholic Encyclopedia.
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- Orans - - (Catholic Encyclopedia.
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- Oratory - - (Catholic Encyclopedia.
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- Orcagna - - (Catholic Encyclopedia.
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- Ordeals - - (Catholic Encyclopedia.
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- Oregon - - (Catholic Encyclopedia.
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- Oremus - - (Catholic Encyclopedia.
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- Oresme, Nicole - - Article by Pierre Duhem on this medieval scientific thinker.
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- Organ - - (Catholic Encyclopedia.
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- Oria - - (Catholic Encyclopedia.
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- Origen and Origenism - - Provides a biography and review of his works, as well as commentary on posthumous influences and the Origenistic Crises.
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- Orkneys - - (Catholic Encyclopedia.
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- Oropus - - (Catholic Encyclopedia.
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- Orsini - - (Catholic Encyclopedia.
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- Orval - - (Catholic Encyclopedia.
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- Orvieto - - (Catholic Encyclopedia.
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- Osaka - - (Catholic Encyclopedia.
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- Osbald - - (Catholic Encyclopedia.
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- Osbern - - (Catholic Encyclopedia.
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- Osee - - The prophet and his book.
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- Osimo - - (Catholic Encyclopedia.
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- Osmund, Saint - - A Norman by birth, Osmund became bishop of Salisbury, and died in 1099.
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- Oswald, Saint - - Archbishop of York, d. 992 while washing the feet of the poor, as was his daily custom during Lent.
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- Oswin, Saint - - Biography of the king and martyr, who was murdered in 651.
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- Othlo - - (Catholic Encyclopedia.
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- Othmar, Saint - - First abbot of St. Gall. He died in prison in 759.
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- Otranto - - (Catholic Encyclopedia.
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- Otto II - - (Catholic Encyclopedia.
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- Otto IV - - (Catholic Encyclopedia.
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- Otto, Saint - - Swabian courtier, was named bishop of Bamberg in 1102, and founded over twenty monasteries.
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- Ouen, Saint - - Seventh-century Archbishop of Rouen, founder of several monasteries, devoted to theological studies, friend of St. Eloi.
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- Oxford - - (Catholic Encyclopedia.
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- Oxford Movement, The (1833-1845) - - Lengthy historical article on the Tractarian Movement includes information on John Henry Newman, as well as on other leading lights of this nineteenth-century Anglo-Catholic campaign, such as John Keble and Hurrell Froude.
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- Ozias - - (Catholic Encyclopedia.
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