Books by Church Fathers, Doctors, Saints, Notable Authors

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• Oakeley, Frederick

  English Tractarian and convert (1802-1880)

• O Antiphons

  Seven antiphons to the Magnificat, used in the Divine Office in the days preceding Christmas

• Oates's Plot

  A 'Popish Plot' which, during the reign of Charles II of England, Titus Oates pretended to have discovered.

• Oaths

  An invocation to God to witness the truth of a statement

• Oaths, English Post-Reformation

  The English Reformation having been imposed by the Crown, it was natural that submission to the essential points of its formularies should have been exacted with some solemnity, by oath, test, or formal declaration...

• Oaxaca

  Diocese and city in the southern part of Mexico

• Obazine, Monastery of

  Located in the Diocese of Tulle; founded by St. Stephen of Obazine about 1134.

• Obba

  Titular see in Byzacena, northern Africa of unknown history

• Obedience

  The complying with a command or precept.

• Obedience, Religious

  The general submission which religious vow to God, and voluntarily promise to their superiors, in order to be directed by them in the ways of perfection according to the purpose and constitutions of their order.

• Obedientiaries

  The lesser officials of a monastery who were appointed by will of the superior.

• Oblate Sisters of Providence

  A congregation of black nuns founded at Baltimore, Maryland

• Oblates of Mary Immaculate

  Religious society founded in 1816

• Oblates of St. Francis de Sales

  A congregation of priests founded originally by Saint Francis de Sales at the request of Saint Jane de Chantal.

• Oblati, Oblatæ, Oblates

  A word used to describe any persons, not professed monks or friars, who have been offered to God, or have dedicated themselves to His service, in holy religion.

• Obligation

  Defined in the 'Institutes' of Justinian as a 'legal bond which by a legal necessity binds us to do something according to the laws of our State'

• O'Braein, Tighernach

  Irish annalist and abbot (d. 1088)

• Obregonians

  Congregation of Franciscan men founded by Bernardino Obregon

• Obreption

  A type of fraud by which an ecclesiastical rescript is obtained

• O'Brien, Terence Albert

  Irish Dominican (1600-1651)

• O'Bruadair, David

  Irish poet (1625-1698)

• Observatory, Vatican

  Gregory XIII ordered a tower to be erected in a convenient part of the Vatican buildings, and to be fitted out with the greatest and best instruments of the time

• O'Callaghan, Edmund Bailey

  Physician, publicist, and historian (1797-1880)

• O'Carolan, Torlogh

  Called 'the last of the Irish bards' (1670-1737)

• Occam, William of

  Biographical article on the fourteenth-century Franciscan philosopher

• Occasionalism

  The metaphysical theory which maintains that finite things have no efficient causality of their own, but that whatever happens in the world is caused by God, creatures being merely the 'occasions' of the Divine activity.

• Occasions of Sin

  External circumstances — things or persons — which incite or entice one to sin.

• Occleve, Thomas

  English poet (1368-1450)

• Occult Art, Occultism

  An attempt to work apparent miracles not by the power of God, but by the use of hidden forces beyond man's control

• Occurrence

  The coinciding of two liturgical offices on one and the same day

• Oceania, Vicariate Apostolic of Central

  Vicariate in western Oceania

• O'Connell, Daniel

  Irish patriot (1775-1847)

• 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

• O'Conor, Charles

  Called 'the Venerable.' Eighteenth-century Irish antiquarian

• Octavarium Romanum

  A liturgical book which may be considered as an appendix to the Roman Breviary

• Octave

  A period of eight days, often observed liturgically

• O'Cullenan, Gelasius

  Cistercian Abbot of Boyle, Ireland (d. 1580)

• O'Curry, Eugene

  Irish scholar (1796-1862)

• O'Daly, Daniel

  Diplomat and historian (1595-1662)

• O'Daly, Donogh Mór

  Irish poet (d. 1244)

• Odense, Ancient See of Odense

  Former diocese located in Denmark

• Odescalchi, Carlo

  Cardinal, prince, archbishop, and Jesuit (1786-1841)

• O Deus Ego Amo Te

  The first line of two Latin lyrics sometimes attributed to St. Francis Xavier

• O'Devany, Cornelius

  Bishop of Down and Connor, Ireland (1532-1612)

• Odilia, Saint

  Patroness of Alsace, d. 720, founded the convent of Hohenburg

• Odilo, Saint

  Abbot of Cluny. He died in 1048

• Odington, Walter

  English Benedictine (d. 1330)

• Odin, John Mary

  Lazarist missionary and bishop (1801-1870)

• O'Donnell, Edmund

  The first Jesuit executed by the English government (1542-1575)

• O'Donovan, John

  Irish historian and antiquarian (1806-1861)

• Odo of Cambrai, Blessed

  Benedictine abbot, bishop of Cambrai, exiled for political reasons, d. 1113

• Odo of Canterbury

  Abbot of Battle (d. 1200)

• Odo of Cheriton

  Preacher and fabulist (d. 1247)

• Odo of Glanfeuil

  Abbot and ninth-century hagiographer

• Odo, Saint

  Second abbot of Cluny, died 942

• Odo, Saint

  Benedictine monk, Archbishop of Canterbury, died in 959

• O'Dugan, John

  Irish writer (d. 1372)

• O'Dwyer, Joseph

  American physician, inventor of intubation (1841-1898)

• Oertel, John James Maximilian

  Bavarian journalist (1811-1882)

• Oettingen

  Abbey in Bavaria

• Offa

  King of Mercia (d. 796)

• Offerings

  Covers the Jewish and Christian practices of offerings and tithes

• Offertory

  The rite by which the bread and wine are presented to God before they are consecrated

• Office of the Dead

  Historical article on a special set of prayers for the deceased

• O'Fihely, Maurice

  Archbishop of Tuam (1460-1513)

• O Filii et Filiæ

  The first line of a hymn celebrating the mystery of Easter.

• Ogdensburg, Diocese of

  Diocese in upstate New York

• Oggione, Marco D'

  Milanese painter (1470-1549)

• Ogilvie, John, Venerable

  Scotsman, raised Calvinist, converted to Catholicism, became a Jesuit priest and missionary to his native land, was tortured and martyred in 1615

• Ogliastra

  Diocese in Sardinia, Italy

• O'Growney, Eugene

  Irish-American priest, patriot, and scholar (1863-1899)

• O'Hagan, John

  Irish lawyer and man of letters (1822-1890)

• O'Hagan, Thomas

  First Baron of Tullyhogue (1812-1885)

• O'Hanlon, John

  Irish-American priest (1821-1905)

• O'Hara, Theodore

  American writer (1822-1867)

• O'Hely, Patrick

  Bishop of Mayo, Ireland (d. 1579)

• O'Herlahy, Thomas

  Bishop of Ross, Ireland (d. 1579)

• O'Higgins, Ambrose and Bernard

  South American patriots of Irish background

• Ohio

  The seventeenth state of the American Union

• Ohler, Aloys Karl

  German educationist (1817-1889)

• O'Hurley, Dermond

  Archbishop of Cashel, Ireland (d. 1584)

• O'Hussey, Maelbrighte

  Franciscan friar (d. 1614)

• Oil of Saints

  An oily substance which flows from the relics or burial places of certain saints

• Ointment in Scripture

  That the use of oily, fragrant materials to anoint the body is a custom going back to remote antiquity is evidenced by the Old Testament as well as other early literatures...

• Ojeda, Alonso de

  Spanish explorer (1466-1508)

• Okeghem, Jean d'

  Contrapuntist, founder and head of the second Netherland school (1430-1495)

• Oklahoma

  The forty-sixth state of the Union

• Oláh, Nicolaus

  Hungarian archbishop (1493-1568)

• Olba

  Titular see in Isauria, suffragan of Seleucia.

• Old Catholics

  The sect organised in German-speaking countries to combat the dogma of Papal Infallibility.

• Old Chapter, The

  The origin of the body, fomerly known as the Old Chapter, dates from 1623...

• Oldcorne, Ven. Edward

  Englishman, Jesuit priest, martyred in 1606. Biography

• Oldenburg

  A grand duchy, one of the twenty-six federated states of the German Empire.

• Old Hall (St. Edmund's College)

  Founded in 1793 in Hertfordshire, England

• Oldham, Hugh

  Bishop of Exeter (d. 1519)

• Oldoini, Augustino

  Historian and bibliographer (1612-1683)

• Old Testament

  The Apostle St. Paul declares himself (II Cor., iii, 6) a minister 'of the new testament', and calls (iii, 14) the covenant entered into on Mount Sinai 'the old testament'

• O'Leary, Arthur

  Irish Franciscan, preacher, polemical writer (1729-1802)

• Olenus

  Titular see and suffragan of Patras, in Achaia Quarta

• Olesnicki, Zbigniew

  Polish cardinal and statesman (1389-1455)

• Olier, Jean-Jacques

  Founder of the seminary and Society of St-Sulpice (1608-1657)

• Olinda

  Diocese in Brazil

• Oliva

  Suppressed Cistercian abbey near Danzig, founded sometime between 1170-78.

• Oliva, Gian Paolo

  Genoese Jesuit (1600-1681)

• Olivaint, Pierre

  French convert (b. 1816)

• Oliver, George

  English priest (1781-1861)

• Olivetans

  A branch of the white monks of the Benedictine Order, founded in 1319.

• Olivet, Mount

  A hill immediately east of Jerusalem

• Olivier de la Marche

  Belgian chronicler and poet (1426-1501)

• Olivi, Pierre Jean

  Spiritual Franciscan and theological author (1248-1298)

• Ollé-Laprune, Léon

  French Catholic philosopher (1839-1898)

• Olmütz

  Archdiocese in Moravia

• Olympias, Saint

  Widow, deaconess, renowned for her almsgiving, and a staunch supporter of St. John Chrysostom

• Olympus

  Titular see of Lycia in Asia Minor.

• Omaha

  Diocese in Nebraska, United States

• Ombus

  Titular see and suffragan of Ptolemais in Thebais Secunda.

• O'Meara, Kathleen

  Irish novelist and biographer (1839-1888)

• Omer, Saint

  Swiss-born bishop of Terouenne in Belgic Gaul, founder of a monastery. He died in about 670

• Omission

  The failure to do something one can and ought to do

• Omnipotence

  The power of God to effect whatever is not intrinsically impossible

• O'Neill, Hugh

  Earl of Tyrone (1550-1616)

• O'Neill, Owen Roe

  Soldier (1582-1649)

• Onias

  Name of several Jewish high priests who lived two and three centuries before Christ

• Ontario

  A province in Canada

• Ontologism

  An ideology which maintains that God and divine ideas are the first object of our intelligence and the intuition of God the first act of our individual knowledge

• Ontology

  An article on 'the science of being'

• Oostacker, Shrine of

  Miraculous shrine of the Blessed Virgin in Belgium

• Ophir

  A people and a country mentioned in the Bible

• Oporto

  Diocese in Portugal

• Oppenordt, Gilles-Marie

  French rococo artist (1672-1742)

• Oppido Mamertina

  Diocese of Oppido Mamertina in Reggio Calabria, Italy

• Optatus, Saint

  Fairly long essay on the life and writings of this bishop, who argued against the Donatists. He died in about 387

• Optimism

  A metaphysical theory or an emotional disposition.

• Option, Right of

  In canon law, a way of obtaining a benefice or a title, by the choice of the new titulary himself.

• O'Queely, Malachias

  Archbishop of Tuam, Ireland (d. 1645)

• Oracle

  A Divine communication given at a special place through specially appointed persons; also the place itself.

• Oran

  Diocese in Algeria

• Orange, Councils of

  Two councils that were held in southern France

• Orange Free State

  One of the four provinces of the Union of South Africa

• Orange River

  Vicariate apostolic in South Africa

• Orans

  An iconographic type, commonly found in the Roman catacombs, of a female figure praying with extended arms

• Orate Fratres

  The exhortation addressed by the celebrant to the people before the Secrets in the Roman Mass

• Oratorio

  A musical composition for solo voices, chorus, orchestra, and organ, to a religious text generally taken from Holy Scripture.

• Oratory

  A structure other than a parish church, set aside by Church authority for prayer and the celebration of Mass

• Oratory, French Congregation of the

  Congregation founded in Paris at the beginning of the seventeenth century by Cardinal Pierre de Berulle

• Oratory of Saint Philip Neri, The

  Italian, Spanish, English, and other communities, which follow the rule of St. Philip Neri.

• Orbellis, Nicolas d'

  Franciscan theologian and philosopher and Scotist (1400-1475)

• Orcagna

  Florentine poet, artist and architect (d. 1368)

• Orcistus

  Titular see in Galatia Secunda.

• Ordeals

  A means of obtaining evidence by trials, through which the guilt or innocence of an accused person was supposedly established

• Ordericus Vitalis

  Norman historian (1075-1143)

• Ordinariate

  This term is used in speaking collectively of all the various organs through which an ordinary, and especially a bishop, exercises the different forms of his authority.

• Ordinary

  Denotes any person possessing or exercising ordinary jurisdiction

• Ordines Romani

  The brief conspectus of the daily Office and Mass as adapted to the local calendar

• Oregon

  One of the Pacific Coast States

• Oregon City

  Former archdiocese in Oregon, United States

• O'Reilly, Bernard

  Irish-American historian (1820-1907)

• O'Reilly, Edmund

  Archbishop of Armagh (1616-1669)

• O'Reilly, Edmund

  English theologian (1811-1878)

• O'Reilly, Hugh

  Archbishop of Armagh (b. 1580)

• O'Reilly, John Boyle

  Poet, novelist, and editor (1844-1890)

• O'Reilly, Myles William Patrick

  Irish soldier, publicist, litterateur (1825-1880)

• Oremus

  Invitation to pray, said before collects and other short prayers and occurring continually in the Roman Rite.

• Orense

  Diocese and suffragan of Compostela in Spain

• Oresme, Nicole

  Article by Pierre Duhem on this medieval scientific thinker

• Organ

  A musical instrument which consists of one or several sets of pipes, each pipe giving only one tone, and which is blown and played by mechanical means.

• Oria

  Diocese near Brindisi in Italy

• Oriani, Barnaba

  Italian Barnabite and astronomer (1752-1832)

• Oriental Study and Research

  Comprises the scientific investigation and discussion of all topics — linguistics, archaeology, ethnology, etc. — connected with the East

• Orientation of Churches

  According to Tertullian the Christians of his time were, by some who concerned themselves with their form of worship, believed to votaries of the sun...

• Orientius

  Christian Latin poet of the fifth century.

• Oriflamme

  Legendary banner

• Origen and Origenism

  Provides a biography and review of his works, as well as commentary on posthumous influences and the Origenistic Crises

• Original Sin

  Original sin is (1) the sin that Adam committed; (2) a consequence of this first sin, the hereditary stain with which we are born on account of our origin or descent from Adam.

• Orihuela

  Diocese in Spain

• Oriol, Saint Joseph

  Earned a doctorate in theology, served as a parish priest, renowned for gifts of prophecy and miracles. St. Joseph died in 1702

• Oristano

  Diocese in Sardinia, Italy

• Orkneys

  A group of islands lying to the north of Scotland

• Orlandini, Niccolò

  Italian Jesuit (1554-1606)

• Orléans

  Diocese in France, suffragan of Paris

• Orléans, Councils of

  Six national councils held in the Merovingian period.

• Orley, Barent Van

  Belgian painter (1491-1542)

• Orme, Philibert de l'

  French architect (1512-1570)

• Oropus

  Titular see, suffragan of Anazarbus in Cilicia Secunda.

• O'Rorke, Patrick Henry

  Irish-American soldier, killed at Gettysburg (1837-1863)

• Orosius, Paulus

  Historian and Christian apologist (b. c. 380)

• Orphans and Orphanages

  The death of one or both parents makes the child of the very poor a ward of the community...

• Orsi, Giuseppe Agostino

  Florentine cardinal, theologian, and church historian (1692-1761)

• Orsini

  One of the most ancient and distinguished families of the Roman nobility, whose members often played an important role in the history of Italy

• Orsisius

  Egyptian monk of the fourth century

• Ortelius, Abraham

  Belgian cartographer, geographer and archeologist (1527-1598)

• Orthodox Church

  The body of Christians in union with the Patriarch of Constantinople but in schism with the Pope of Rome.

• Orthodoxy

  Right belief or purity of faith.

• Orthodoxy, Feast of

  Eastern feast that commemorates the restoration of the holy icons to the churches in 842

• Orthosias

  Titular see of Phoenicia Prima, suffragan of Tyre.

• Ortolano Ferrarese

  Painter of the Ferrara School (1490-1525)

• Orval

  Former Cistercian abbey in Luxemburg

• Orvieto

  Diocese in central Italy

• Ory, Matthieu

  French inquisitor and theologian (1492-1557)

• Osaka

  Large city in Japan

• O Salutaris Hostia

  Hymn used for the Benediction of the Most Blessed Sacrament

• Osbald

  King of Northumbria (d. 799)

• Osbaldeston, Edward, Venerable

  Profile of the English priest and martyr, who was executed at York in 1594

• Osbern

  English hagiographer (d. c. 1090)

• Oscott (St. Mary's College)

  Founded in England in 1793

• Osimo

  Diocese in Ascoli Piceno, Italy

• Oslo, Ancient See of

  Former diocese located in Norway

• Osma

  Diocese in Spain

• Osmund, Saint

  A Norman by birth, Osmund became bishop of Salisbury, and died in 1099

• Osnabrück

  Diocese in Germany, directly subject to the Holy See

• Ossat, Arnaud d'

  French cardinal, diplomat, and writer (1537-1604)

• Ossory, Diocese of

  Diocese in Ireland

• Ostia and Velletri

  Suburbicarian diocese near Rome

• Ostiensis

  Benedictine chronicler (1045-1115)

• Ostracine

  Titular see and suffragan of Pelusium in Augustamnica prima.

• Ostraka, Christian

  Inscriptions on clay, wood, metal, and other hard materials.

• Ostrogoths

  One of the two chief tribes of the Goths

• O'Sullivan Beare, Philip

  Irish writer (1590-1660)

• Oswald, Saint

  Archbishop of York, d. 992 while washing the feet of the poor, as was his daily custom during Lent

• Oswald, Saint

  King of Northumbria and martyr, d. 642

• Oswin, Saint

  Biography of the king and martyr, who was murdered in 651

• Otfried of Weissenburg

  The oldest German poet known by name (9th century)

• Othlo

  Benedictine monk of Ratisbon (1013-1072)

• Othmar, Saint

  First abbot of St. Gall. He died in prison in 759

• Otho, Marcus Salvius

  Details on the reign of Roman Emperor

• Otranto

  An archdiocese and city in Apulia, southern Italy

• Ottawa, Archdiocese of

  Archdiocese of Ottawa in Canada

• Ottawa, University of

  Conducted by the Oblates of Mary Immaculate; founded in 1848.

• Ottobeuren

  Benedictine abbey in Bavaria

• Otto II

  King of the Germans and Emperor of Rome (955-983)

• Otto III

  German king and Roman emperor (980-1002)

• Otto I, the Great

  Roman emperor and German king (912-973)

• Otto IV

  German king and Roman emperor (1182-1218)

• Otto of Freising

  Bishop and historian (1111-1158)

• Otto of Passau

  Franciscan theologian

• Otto of St. Blasien

  German chronicler (d. 1223)

• Otto, Saint

  Swabian courtier, was named bishop of Bamberg in 1102, and founded over twenty monasteries

• 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

  The invocation 'Help of Christians' originated in the sixteenth century.

• Our Lady of Good Counsel, Feast of

  Feast honoring a popular Marian devotion

• Our Lady of Perpetual Help

  A famous Byzantine-style picture painted on wood, with a background of gold

• Our Lady of the Fields, Brothers of

  A Canadian congregation founded in 1902 in the Diocese of Quebec by Father Brousseau.

• Our Lady of the Snow

  Feast commemorating the dedication of the church of Santa Maria Maggiore in Rome

• Overbeck, Friedrich

  Convert and religious painter (1789-1869)

• Overberg, Bernhard Heinrich

  German ecclesiastic and educator (1754-1826)

• Overpopulation, Theories of

  Down to the end of the eighteenth century, very little attention was given to the relation between increase of population and increase of subsistence...

• Oviedo

  Diocese in Spain

• Oxenford, John

  English dramatist, critic, translator, and song-writer (1812-1877)

• Oxenham, Henry Nutcombe

  English controversialist and poet (1829-1888)

• Oxford

  Oxford, one of the most ancient cities in England, grew up under the shadow of a convent, said to have been founded by St. Frideswide as early as the eighth century...

• Oxford Movement, The

  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

  Famous institution in England

• Oxyrynchus

  Titular archdiocese of Heptanomos in Egypt.

• Ozanam, Antoine-Frédéric

  Great grand-nephew of Jacques Ozanam (1813-1853)

• Ozanam, Jacques

  French mathematician (1640-1717)

• Ozias

  Name of six Israelites mentioned in the Bible