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O Antiphons - (Catholic Encyclopedia)
O Deus Ego Amo Te - (Catholic Encyclopedia)
O Filii et Filiae - (Catholic Encyclopedia)
O Salutaris Hostia - (Catholic Encyclopedia)
Oakeley, Frederick - (Catholic Encyclopedia)
Oates's Plot - (Catholic Encyclopedia)
Oaths - (Catholic Encyclopedia)
Oaths, English Post-Reformation - (Catholic Encyclopedia)
Oaxaca - (Catholic Encyclopedia)
Obazine, Monastery of - (Catholic Encyclopedia)
Obba - (Catholic Encyclopedia)
Obedience - (Catholic Encyclopedia)
Obedience, Religious - (Catholic Encyclopedia)
Obedientiaries - (Catholic Encyclopedia)
Oblate Sisters of Providence - (Catholic Encyclopedia)
Oblates of Mary Immaculate - (Catholic Encyclopedia)
Oblates of Saint Francis de Sales - (Catholic Encyclopedia)
Oblati, Oblatae, Oblates - (Catholic Encyclopedia)
Obligation - (Catholic Encyclopedia)
O'Braein, Tighernach - (Catholic Encyclopedia)
Obregonians - (Catholic Encyclopedia)
Obreption - (Catholic Encyclopedia)
O'Brien, Terence Albert - (Catholic Encyclopedia)
O'Bruadair, David - (Catholic Encyclopedia)
O'Callaghan, Edmund Bailey - (Catholic Encyclopedia)
O'Carolan, Torlogh - (Catholic Encyclopedia)
Occasionalism - (Catholic Encyclopedia)
Occasions of Sin - (Catholic Encyclopedia)
Occult Art, Occultism - (Catholic Encyclopedia)
O'Connell, Daniel - (Catholic Encyclopedia)
O'Conor, Charles - Called "the Venerable." Eighteenth-century Irish antiquarian.
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.
Octavarium Romanum - (Catholic Encyclopedia)
Octave - (Catholic Encyclopedia)
O'Cullenan, Gelasius - (Catholic Encyclopedia)
O'Curry, Eugene - (Catholic Encyclopedia)
O'Daly, Daniel - (Catholic Encyclopedia)
O'Daly, Donogh Mór - (Catholic Encyclopedia)
Odense, Ancient See of - (Catholic Encyclopedia)
Odescalchi, Carlo - (Catholic Encyclopedia)
O'Devany, Cornelius - (Catholic Encyclopedia)
Odilia, Saint - Patroness of Alsace, d. 720, founded the convent of Hohenburg.
Odilo, Saint - Abbot of Cluny. He died in 1048.
Odin, John Mary - (Catholic Encyclopedia)
Odington, Walter - (Catholic Encyclopedia)
Odo of Cambrai, Blessed - Benedictine abbot, bishop of Cambrai, exiled for political reasons, d. 1113.
Odo of Canterbury - (Catholic Encyclopedia)
Odo of Cheriton - (Catholic Encyclopedia)
Odo of Glanfeuil - (Catholic Encyclopedia)
Odo, Saint - Second abbot of Cluny, died 942.
Odo, Saint - Benedictine monk, Archbishop of Canterbury, died in 959.
O'Donnell, Edmund - (Catholic Encyclopedia)
O'Donovan, John - (Catholic Encyclopedia)
O'Dugan, John - (Catholic Encyclopedia)
O'Dwyer, Joseph - (Catholic Encyclopedia)
Oecolampadius, John - (Catholic Encyclopedia)
Oeconomus, Episcopal - (Catholic Encyclopedia)
Oecumenius - (Catholic Encyclopedia)
Oertel, John James Maximilian - (Catholic Encyclopedia)
Oettingen - (Catholic Encyclopedia)
Offa - (Catholic Encyclopedia)
Offerings - (Catholic Encyclopedia)
Offertory - (Catholic Encyclopedia)
Office of the Dead - Historical article on a special set of prayers for the deceased.
O'Fihely, Maurice - (Catholic Encyclopedia)
Ogdensburg, Diocese of - (Catholic Encyclopedia)
Oggione, Marco D' - (Catholic Encyclopedia)
Ogliastra - (Catholic Encyclopedia)
O'Growney, Eugene - (Catholic Encyclopedia)
O'Hagan, John - (Catholic Encyclopedia)
O'Hagan, Thomas - (Catholic Encyclopedia)
O'Hanlon, John - (Catholic Encyclopedia)
O'Hara, Theodore - (Catholic Encyclopedia)
O'Hely, Patrick - (Catholic Encyclopedia)
O'Herlahy, Thomas - (Catholic Encyclopedia)
O'Higgins, Ambrose and Bernard - (Catholic Encyclopedia)
Ohio - (Catholic Encyclopedia)
Ohler, Aloys Karl - (Catholic Encyclopedia)
O'Hurley, Dermond - (Catholic Encyclopedia)
O'Hussey, Maelbrighte - (Catholic Encyclopedia)
Oil of Saints - (Catholic Encyclopedia)
Ointment in Scripture - (Catholic Encyclopedia)
Ojeda, Alonso de - (Catholic Encyclopedia)
Okeghem, Jean d' - (Catholic Encyclopedia)
Oklahoma - (Catholic Encyclopedia)
Olaf Haraldson, Saint - Martyr and King of Norway, d. 1030.
Olah, Nicolaus - (Catholic Encyclopedia)
Olba - (Catholic Encyclopedia)
Old Catholics - (Catholic Encyclopedia)
Old Chapter, The - (Catholic Encyclopedia)
Old Hall (St. Edmund's College) - (Catholic Encyclopedia)
Oldenburg - (Catholic Encyclopedia)
Oldham, Hugh - (Catholic Encyclopedia)
Oldoini, Augustino - (Catholic Encyclopedia)
O'Leary, Arthur - (Catholic Encyclopedia)
Olenus - (Catholic Encyclopedia)
Olesnicki, Zbigniew - (Catholic Encyclopedia)
Olier, Jean-Jacques - (Catholic Encyclopedia)
Olinda - (Catholic Encyclopedia)
Oliva - (Catholic Encyclopedia)
Oliva, Gian Paolo - (Catholic Encyclopedia)
Olivaint, Pierre - (Catholic Encyclopedia)
Oliver, George - (Catholic Encyclopedia)
Oliver Plunket, Saint - Biographical article on the professor of theology, Archbishop of Armagh and Primate of All Ireland, martyred in 1681.
Olivet, Mount - (Catholic Encyclopedia)
Olivetans - (Catholic Encyclopedia)
Olivi, Pierre Jean - (Catholic Encyclopedia)
Olivier de la Marche - (Catholic Encyclopedia)
Ollé-Laprune, Léon - (Catholic Encyclopedia)
Olmütz - (Catholic Encyclopedia)
O'Loghlen, Michael - (Catholic Encyclopedia)
Olympias, Saint - Widow, deaconess, renowned for her almsgiving, and a staunch supporter of St. John Chrysostom.
Olympus - (Catholic Encyclopedia)
Omaha, Diocese of - (Catholic Encyclopedia)
Ombus - (Catholic Encyclopedia)
O'Meara, Kathleen - (Catholic Encyclopedia)
Omer, Saint - Swiss-born bishop of Terouenne in Belgic Gaul, founder of a monastery. He died in about 670.
Omission - (Catholic Encyclopedia)
Omnipotence - (Catholic Encyclopedia)
O'Neill, Hugh - (Catholic Encyclopedia)
O'Neill, Owen Roe - (Catholic Encyclopedia)
Onias - (Catholic Encyclopedia)
Ontario - (Catholic Encyclopedia)
Ontologism - (Catholic Encyclopedia)
Ontology - (Catholic Encyclopedia)
Oostacker, Shrine of - (Catholic Encyclopedia)
Ophir - (Catholic Encyclopedia)
Oporto - (Catholic Encyclopedia)
Oppenordt, Gilles-Marie - (Catholic Encyclopedia)
Oppido Mamertina - (Catholic Encyclopedia)
Optatus, Saint - Fairly long essay on the life and writings of this bishop, who argued against the Donatists. He died in about 387.
Optimism - (Catholic Encyclopedia)
Option, Right of - (Catholic Encyclopedia)
O'Queely, Malachias - (Catholic Encyclopedia)
Oracle - (Catholic Encyclopedia)
Oran - (Catholic Encyclopedia)
Orange, Councils of - (Catholic Encyclopedia)
Orange Free State - (Catholic Encyclopedia)
Orange River, Vicariate Apostolic of - (Catholic Encyclopedia)
Orans - (Catholic Encyclopedia)
Orate Fratres - (Catholic Encyclopedia)
Oratorio - (Catholic Encyclopedia)
Oratory - (Catholic Encyclopedia)
Oratory, French Congregation of the - (Catholic Encyclopedia)
Oratory of Saint Philip Neri, The - (Catholic Encyclopedia)
Orbellis, Nicolas d' - (Catholic Encyclopedia)
Orcagna - (Catholic Encyclopedia)
Orcistus - (Catholic Encyclopedia)
Ordeals - (Catholic Encyclopedia)
Ordericus Vitalis - (Catholic Encyclopedia)
Orders, Holy - (Catholic Encyclopedia)
Ordinariate - (Catholic Encyclopedia)
Ordinary - (Catholic Encyclopedia)
Ordines Romani - (Catholic Encyclopedia)
Oregon - (Catholic Encyclopedia)
Oregon City - (Catholic Encyclopedia)
O'Reilly, Bernard - (Catholic Encyclopedia)
O'Reilly, Edmund (Archbishop of Armagh) - (Catholic Encyclopedia)
O'Reilly, Edmund (Theologian) - (Catholic Encyclopedia)
O'Reilly, Hugh - (Catholic Encyclopedia)
O'Reilly, John Boyle - (Catholic Encyclopedia)
O'Reilly, Myles William Patrick - (Catholic Encyclopedia)
Oremus - (Catholic Encyclopedia)
Orense, Diocese of - (Catholic Encyclopedia)
Oresme, Nicole - Article by Pierre Duhem on this medieval scientific thinker.
Organ - (Catholic Encyclopedia)
Oria - (Catholic Encyclopedia)
Oriani, Barnaba - (Catholic Encyclopedia)
Oriental Study and Research - (Catholic Encyclopedia)
Orientation of Churches - (Catholic Encyclopedia)
Orientius - (Catholic Encyclopedia)
Oriflamme - (Catholic Encyclopedia)
Origen and Origenism - Provides a biography and review of his works, as well as commentary on posthumous influences and the Origenistic Crises.
Original Sin - (Catholic Encyclopedia)
Orihuela - (Catholic Encyclopedia)
Oristano - (Catholic Encyclopedia)
Orkneys - (Catholic Encyclopedia)
Orlandini, Niccolò - (Catholic Encyclopedia)
Orléans, Councils of - (Catholic Encyclopedia)
Orléans, Diocese of - (Catholic Encyclopedia)
Orley, Barent Van - (Catholic Encyclopedia)
Orme, Philibert de l' - (Catholic Encyclopedia)
Oropus - (Catholic Encyclopedia)
O'Rorke, Patrick Henry - (Catholic Encyclopedia)
Orosius, Paulus - (Catholic Encyclopedia)
Orphans and Orphanages - (Catholic Encyclopedia)
Orsi, Giuseppe Agostino - (Catholic Encyclopedia)
Orsini - (Catholic Encyclopedia)
Orsisius - (Catholic Encyclopedia)
Ortelius, Abraham - (Catholic Encyclopedia)
Orthodox Church - (Catholic Encyclopedia)
Orthodoxy - (Catholic Encyclopedia)
Orthodoxy, Feast of - (Catholic Encyclopedia)
Orthosias - (Catholic Encyclopedia)
Ortolano Ferrarese - (Catholic Encyclopedia)
Orval - (Catholic Encyclopedia)
Orvieto - (Catholic Encyclopedia)
Ory, Matthieu - (Catholic Encyclopedia)
Osaka - (Catholic Encyclopedia)
Osbald - (Catholic Encyclopedia)
Osbern - (Catholic Encyclopedia)
Oscott (St. Mary's College) - (Catholic Encyclopedia)
Osee - The prophet and his book.
Osimo - (Catholic Encyclopedia)
Oslo, Ancient See of - (Catholic Encyclopedia)
Osma, Diocese of - (Catholic Encyclopedia)
Osmund, Saint - A Norman by birth, Osmund became bishop of Salisbury, and died in 1099.
Osnabrück, Diocese of - (Catholic Encyclopedia)
Ossat, Arnaud d' - (Catholic Encyclopedia)
Ossory, Diocese of - (Catholic Encyclopedia)
Ostensorium (Monstrance) - (Catholic Encyclopedia)
Ostia and Velletri - (Catholic Encyclopedia)
Ostiensis - (Catholic Encyclopedia)
Ostracine - (Catholic Encyclopedia)
Ostraka, Christian - (Catholic Encyclopedia)
Ostrogoths - (Catholic Encyclopedia)
O'Sullivan Beare, Philip - (Catholic Encyclopedia)
Oswald, Saint - King of Northumbria and martyr, d. 642.
Oswald, Saint - Archbishop of York, d. 992 while washing the feet of the poor, as was his daily custom during Lent.
Oswin, Saint - Biography of the king and martyr, who was murdered in 651.
Otfried of Weissenburg - (Catholic Encyclopedia)
Othlo - (Catholic Encyclopedia)
Othmar, Saint - First abbot of St. Gall. He died in prison in 759.
Otho, Marcus Salvius - Details on the reign of Roman Emperor.
Otranto - (Catholic Encyclopedia)
Ottawa, Archdiocese of - (Catholic Encyclopedia)
Ottawa, University of - (Catholic Encyclopedia)
Otto I (the Great) - (Catholic Encyclopedia)
Otto II - (Catholic Encyclopedia)
Otto III - (Catholic Encyclopedia)
Otto IV - (Catholic Encyclopedia)
Otto of Freising - (Catholic Encyclopedia)
Otto of Passau - (Catholic Encyclopedia)
Otto of St. Blasien - (Catholic Encyclopedia)
Otto, Saint - Swabian courtier, was named bishop of Bamberg in 1102, and founded over twenty monasteries.
Ottobeuren - (Catholic Encyclopedia)
Ouen, Saint - Seventh-century Archbishop of Rouen, founder of several monasteries, devoted to theological studies, friend of St. Eloi.
Our Lady, Help of Christians, Feast of - (Catholic Encyclopedia)
Our Lady of Good Counsel, Feast of - (Catholic Encyclopedia)
Our Lady of the Fields, Brothers of - (Catholic Encyclopedia)
Our Lady of the Snow - (Catholic Encyclopedia)
Overbeck, Friedrich - (Catholic Encyclopedia)
Overberg, Bernhard Heinrich - (Catholic Encyclopedia)
Oviedo, Diocese of - (Catholic Encyclopedia)
Oxenford, John - (Catholic Encyclopedia)
Oxenham, Henry Nutcombe - (Catholic Encyclopedia)
Oxford - (Catholic Encyclopedia)
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.
Oxford, University of - (Catholic Encyclopedia)
Oxyrynchus - (Catholic Encyclopedia)
Ozanam, Antoine-Frédéric - (Catholic Encyclopedia)
Ozanam, Jacques - (Catholic Encyclopedia)
Ozias - (Catholic Encyclopedia) Help build the largest human-edited directory on the web.