1878
Ubi Primum – Allocution (Leo XIII – Mar. 28, 1878)
Inscrutabili Dei Consilio – Encyclical Letter of the Supreme Pontiff On the Evils Affecting Modern Society, Their Causes and Remedies (Leo XIII – Apr. 21, 1878)
Da Grave Sventura – Letter of the Supreme Pontiff to the New Cardinal Secretary of State Lorenzo Nina (Leo XIII – Aug. 27, 1878)
Quod Apostolici Muneris -Encyclical Letter of the Supreme Pontiff On Socialism (Leo XIII – Dec. 28, 1878)
1879
Pontifices Maximi – Brief of the Supreme Pontiff Proclaiming the Jubilee Indulgence (Leo XIII – Feb. 15, 1879)
Ci Siamo Grandamente – Letter of the Supreme Pontiff to the Archbishops and Bishops of the Ecclesiastical Provinces of Turin, Vercelli, and Genoa on the Attack on Christian Marriage (Leo XIII – June 1, 1879)
Aeterni Patris – Encyclical Letter of the Supreme Pontiff On the Restoration of Christian Philosophy (Leo XIII – Aug. 4, 1879)
Iampridem Considerando – Letter of the Supreme Pontiff to the Cardinal Prefect of the Sacred Congregation of Studies on the Re-establishment of Thomistic Scholasticism in Rome (Leo XIII – Oct. 15, 1879)
1880
Placere Nobis – Motu Proprio (Leo XIII – Jan. 18, 1880)
Arcanum Divinae – Encyclical Letter of the Supreme Pontiff On Christian Marriage (Leo XIII – Feb. 10, 1880)
Cum Hoc Sit – Brief of the Supreme Pontiff Declaring St. Thomas Aquinas Patron of the Schools (Leo XIII – Aug. 4, 1880)
Grande Munus – Encyclical Letter of the Supreme Pontiff On Saints Cyril and Methodius (Sept. 30, 1880)
Sancta Dei Civitas – Encyclical Letter of the Supreme Pontiff On Mission Societies (Leo XIII – Dec. 3, 1880)
1881
Pro Religione et Pro Ecclesia – Letter of the Supreme Pontiff (Leo XIII – Jan. 2, 1881)
Militans Jesu – Brief of the Supreme Pontiff Notifying the Whole Catholic World of the Progress of the Enemies of Catholicism and of the Remedy of an Extraordinary Jubilee (Leo XIII – Mar. 12, 1881)
Diuturnum – Encyclical Letter of the Supreme Pontiff On the Origin of Civil Power (Leo XIII – June 29, 1881)
Licet Multa – Encyclical Letter of the Supreme Pontiff On Catholics in Belgium (Leo XIII – Aug. 3, 1881)
1882
Etsi Nos – Encyclical Letter of the Supreme Pontiff Calling on Italy to Fight For the Catholic Religion and the Holy See (Leo XIII – Feb. 15, 1882)
Auspicato Concessum – Encyclical Letter of the Supreme Pontiff Honoring St. Francis of Assisi (Leo XIII – Sept. 17, 1882)
Cum Multa Sint – Encyclical Letter of the Supreme Pontiff On Concord Among Spaniards (Leo XIII – Dec. 8, 1882)
1883
Misericors Dei Filius – Apostolic Constitution of the Supreme Pontiff Renewing and Sanctioning the Rule of the Third Secular Order of St. Francis (Leo XIII – May 30, 1883)
Saepenumero Considerantes – Apostolic Letter to Cardinals De Luca, Pitra, and Hergenroether, On the Opening of the Vatican Archives (Leo XIII – Aug 18, 1883)
Supremi Apostolatus – Encyclical Letter of the Supreme Pontiff Ordering the Month of October Be Dedicated With Devotion to Our Lady of the Rosary (Leo XIII – Sept. 1, 1883)
1884
Nobilissima Gallorum Gens – Encyclical letter of the Supreme Pontiff On The Religious Question in France (Leo XIII – Feb. 8, 1884)
Humanum Genus – Encyclical Letter of the Supreme Pontiff on Freemasonry (Leo XIII – Apr. 20, 1884)
Superiore Anno – Encyclical Letter of the Supreme Pontiff Renewing His Orders For the Devoted Honoring of the Blessed Mother of God in the Month of October (Leo XIII – Aug. 30, 1884)
1885
Litterae Tuae – Apostolic Letter of the Supreme Pontiff On the Submission That is Incumbent On Writers as Regards Religious Affairs and the Action of the Church in Relation to Catholic Society (Leo XIII – June 17, 1885)
Immortale Dei – Encyclical Letter of the Supreme Pontiff on the Christian Constitution of States (Leo XIII – Nov. 1, 1885)
Spectata Fides – Encyclical Letter of the Supreme Pontiff On Christian Education in Great Britain (Leo XIII – Nov. 27, 1885)
Quod Auctoritate – Encyclical Letter of the Supreme Pontiff Proclaiming an Extraordinary Jubilee (Leo XIII – Dec. 22, 1885)
1886
Iampridem – Encyclical Letter of the Supreme Pontiff on Catholicism in Germany (Leo XIII – Jan. 6, 1886)
Dolemus Inter – Brief of the Supreme Pontiff Testifying to the Love Which He Bears to the Illustrious Society of Jesus (Leo XIII – July 13, 1886)
Quod Multum – Encyclical Letter of the Supreme Pontiff Ordering the Strengthening of the Church in Hungary (Leo XIII – Aug. 22, 1886)
Peregrata – Encyclical Letter of the Supreme Pontiff On the Church in Portugal (Leo XIII – Sep. 14, 1886)
Più Volte – Letter of the Supreme Pontiff Promoting Prayers to the Great Virgin of the Rosary in Rome (Leo XIII – Oct. 31, 1886)
1887
Episcoporum Ordinem – Allocution (Leo XIII – May 23, 1887)
Quantunque Le Siano – Letter of the Supreme Pontiff to His Cardinal Secretary of State Declaring His Intentions in the Government of the Universal Church (Leo XIII – June 15, 1887)
Egregii Tui – Letter of the Supreme Pontiff to the Belgian Bishop of Liege on His Upcoming Congress (Leo XIII – July 30, 1887)
Vi e Ben Noto – Encyclical Letter of the Supreme Pontiff to the Bishops of Italy On the Rosary and Public Life (Leo XIII – Sep. 20, 1887)
Vi e Noto – Letter of the Supreme Pontiff to the Bishops of Italy Promoting Devotion to the Virgin of the Rosary (Leo XIII – Sept. 20, 1887)
Officio Sanctissimo – Encyclical Letter of the Supreme Pontiff On the Church in Bavaria (Leo XIII – Dec. 22, 1887)
Domini et Salvatoris – Letter of the Supreme Pontiff Ordering the Collections From the Faithful for the Holy Land (Leo XIII – Dec. 26, 1887)
1888
Quod Anniversarius – Encyclical Letter of the Supreme Pontiff Decreeing a Special Mass For the Dead on the Occassion of His Sacerdotal Jubilee (Leo XIII – Easter, 1888)
In Plurimis – Encyclical Letter of the Supreme Pontiff On the Abolition of Slavery in Brazil (Leo XIII – May 5, 1888)
Libertas – Encyclical Letter of the Supreme Pontiff On the Nature of Liberty (Leo XIII – June 20, 1888)
Saepe Nos – Encyclical Letter of the Supreme Pontiff On Boycotting in Ireland (Leo XIII – June 24, 1888)
Paterna Caritas – Encyclical Letter of the Supreme Pontiff to the Church in Armenia On Reunion With Rome (Leo XIII – July 25, 1888)
Augustum Sanctissimumque – Motu Proprio of the Supreme Pontiff on the Rules of the Vatican Library (Leo XIII – Oct. 1, 1888)
Quam Aerumnosa – Encyclical Letter of the Supreme Pontiff On Italian Immigrants to America (Leo XIII – Dec. 10, 1888)
Est Sane Molestum – Apostolic Letter of the Supreme Pontiff to the Archbishop of Tours In Which Some Journalists are Warned About the Submission and Respect Owed to Bishops, the Legitimate Shepherds of the Faithful (Leo XIII – Dec. 17, 1888)
Etsi Cunctas – Encyclical Letter of the Supreme Pontiff On the Church in Ireland (Leo XIII – Dec. 21, 1888)
Exeunte Iam Anno – Encyclical Letter of the Supreme Pontiff On the Right Ordering of Christian Life (Leo XIII – Dec. 25, 1888)
1889
Nostis Errorem – Allocution of the Supreme Pontiff On Peace in Europe (Leo XIII – Feb. 11, 1889)
La Devozione – Allocution of the Supreme Pontiff on the Auspicious Occassion of His Coronation (Leo XIII – March 2, 1889)
Magni Nobis – Encyclical Letter of the Supreme Pontiff Establishing the Catholic University of America in Washington (Leo XIII – Mar. 7, 1889)
Gratam Scito – Letter of the Supreme Pontiff Praising One Venerable Brother for Episcopal Vigilance (Leo XIII – Mar. 31, 1889)
Amplissimum Collegium – Allocution of the Supreme Pontiff to the Cardinals of H. R. C. at the Completion of Their College (Leo XIII – May 24, 1889)
Litteris Ad Te – Letter of the Supreme Pontiff Enforcing the Condemnation of the Writings of Antonio Rosmini (Leo XIII – June 1, 1889)
Quod Nuper – Allocution of the Supreme Pontiff Condemning the Erection of a Public Monument Glorifying to Posterity the Spirit of Revolt Against the Church (Leo XIII – June 30, 1889)
E Giunto – Letter of the Supreme Pontiff to the Emperor of Brazil Warning of Provisions in the New Brazilian Ministry Connected to Freedom of Worship and Teaching (Leo XIII – July 19, 1889)
Quamquam Pluries – Encyclical Letter of the Supreme Pontiff On Devotion to St. Joseph (Leo XIII – Aug. 15, 1889)
Fra Le Multiplici – Letter of the Supreme Pontiff Appointing that All Priests of Rome Consecrate a Few Days to Retreat and Prayer in the Coming Year (Leo XIII – Dec. 18, 1889)
Colle Espressione – Allocution of the Supreme Pontiff On the Occassion of the Lord’s Christmas (Leo XIII – Dec. 24, 1889)
Tempestivum Quoddam – Allocution of the Supreme Pontiff on the Persecutory Laws Passed in Rome (Leo XIII – Dec. 30, 1889)
1890
Sapientiae Christianae – Encyclical Letter of the Supreme Pontiff On the Chief Duties of Christians as Citizens (Leo XIII – Jan. 10, 1890)
Noi Rendiamo Gracie – Letter of the Supreme Pontiff to His Majesty Wilhelm II, Emperor of Germany and King of Prussia, on His Support of the Working Classes (Leo XIII – Mar. 14, 1890)
Rem Magni – Letter of the Supreme Pontiff to the Archbishop of Cologne on the Social Question and on Nurturing Clergy For the Missions in Africa (Leo XIII – April 20, 1890)
Dall ‘Alto Dell ‘Apostolico Seggio – Encyclical Letter of the Supreme Pontiff On Conquering Freemasonry in Italy (Leo XIII – Oct. 15, 1890)
Catholicae Ecclesiae – Encyclical Letter of the Supreme Pontiff On Eradicating Slavery in Africa (Leo XIII – Nov. 20, 1890)
1891
In Ipso – Encyclical Letter of the Supreme Pontiff On Annual Bishop’s Conferences in Austria (Leo XIII – March 3, 1891)
Rerum Novarum – Encyclical Letter of the Supreme Pontiff On the Condition of the Working Classes (Leo XIII – May 15, 1891)
Pastoralis Vigilantiae – Encyclical Letter of the Supreme Pontiff On Religious Union in Portugal (Leo XIII – June 25, 1891)
Pastoralis Officii – Encyclical Letter of the Supreme Pontiff On the Morality of Dueling (Leo XIII – Sept. 12, 1891)
Grande Est – Allocution of the Supreme Pontiff to Some French Workingmen Upon Their Pilgrimage to Rome (Leo XIII – Sep. 20, 1891)
Octobri Mense – Encyclical Letter of the Supreme Pontiff On the Rosary (Leo XIII – Sept. 22, 1891)
Non Est Opus – Allocution of the Supreme Pontiff On the Growing Hostility of the Widespread Conspiracy Against the Christian Name and the Apostolic See (Leo XIII – Dec. 14, 1891)
1892
Au Milieu Des Sollicitudes – Encyclical of the Supreme Pontiff to the Church in France on the Obedience Due to the Civil Power (Leo XIII – Feb. 16, 1892)
Notre Consolation – Letter of the Supreme Pontiff to the French Cardinals on Religion and Politics in France According to the Encyclical Au Milieu Des Sollicitudes (Leo XIII – May 3, 1892)
Quam Gratae – Letter of the Supreme Pontiff on the Plan of Unity for the Salvation of France (Leo XIII – June 22, 1892)
Quarto Abuente Saeculo – Encyclical Letter of the Supreme Pontiff On The Columbus Quadricentennial (Leo XIII – July 16, 1892)
Magne Dei Matris – Encyclical Letter of the Supreme Pontiff On the Rosary (Leo XIII – Sept. 8, 1892)
Inimica Vis – Encyclical Letter of the Supreme Pontiff On Freemasonry in Italy (Leo XIII – Dec. 8, 1892)
Custodi Di Quella Fede – Encyclical Letter of the Supreme Pontiff On the Effects of and the Fight Against Masonry in Italy (Leo XIII – Oct. 8, 1892)
Letter of the Supreme Pontiff to the Bishop of Orleans on the Situation in France (Leo XIII – Oct. 31, 1892)
Prossimi Come Siamo – Allocution of the Supreme Pontiff On the Action of the Church in Italy (Leo XIII – Dec. 23, 1892)
1893
Il Divisamento – Apostolic Letter of the Supreme Pontiff To the Cardinal Bishop of Verona and the Capitular Vicars of the Venetian Region On the Imposition of the Precedence of the Civil Rite Over the Celebration of Christian Marriage (Leo XIII – Feb. 8, 1893)
Clara Saepenumero – Letter of the Supreme Pontiff to the Cardinal Archbishop of Baltimore on the Question of Public Schools (Leo XIII – May 31, 1893)
Ad Extremas – Encyclical Letter of the Supreme Pontiff On Seminaries for Native Clergy in the Far East (Leo XIII – June 24, 1893)
Constanti Hungarorum – Encyclical Letter of the Supreme Pontiff On Fighting Against the Attack on the Church in Hungary (Leo XIII – Sept. 2, 1893)
Laetitiae Sanctae – Encyclical Letter of the Supreme Pontiff On the Effect of Praying the Rosary on Society (Leo XIII – Sept. 8, 1893)
Non Mediocri – Encyclical Letter of the Supreme Pontiff On the Foundation of a Roman College For Spanish Clerics (Leo XIII – Oct. 25, 1893)
Providentissimus Deus – Encyclical Letter of the Supreme Pontiff On the Study of Holy Scripture (Leo XIII – Nov. 18, 1893)
1894
Felix Nazarethana – Brief of the Supreme Pontiff Granting a Plenary and Other Indulgences For the Visitation of the Loreto Basilica (Leo XIII – Jan. 23, 1894)
Sullo Scorcio – Allocution of the Supreme Pontiff to the Faithful of the Pious Association of the Holy Family (Leo XIII – Jan 28, 1894)
Non Levis – Letter of the Supreme Pontiff to the Bishop of Liege Praising His Manner of Dealing With Division Regarding the Question of the Working Man (Leo XIII – Feb. 26, 1894)
Caritatis – Encyclical Letter of the Supreme Pontiff On the Church in Poland (Leo XIII – Mar. 19, 1894)
Inter Graves – Encyclical Letter of the Supreme Pontiff On Episcopal Synods in Peru (Leo XIII – May 1, 1894)
Quum Questioni – Letter of the Supreme Pontiff to the Rector of the Great Catholic Lyceum of Lille (Leo XIII – June 19, 1894)
Praeclara Gratulationis Publicae – Apostolic Letter of the Supreme Pontiff On the Reunion of Christendom (June 20, 1894)
Litteras a Vobis – Encyclical Letter of the Supreme Pontiff On Building Up the Native Clergy in Brazil (Leo XIII – July 2, 1894)
Perlibenti Quidem – Letter of the Supreme Pontiff to the Clergy of Mexico Supporting Devotion to the Blessed Virgin of Guadalupe (Leo XIII – Aug 7, 1894)
Iucunda Semper Expectatione – Encyclical Letter of the Supreme Pontiff On Seeking Aid Through the Intercession of the Mother of God By Means of the Rosary (Leo XIII – Sept. 8, 1894)
Fra Le Principali – Letter of the Supreme Pontiff on the Production of Periodicals for the Illustration and Propagation of the Sacred Sciences (Leo XIII – Nov. 27, 1894)
Orientalium Dignitas – Apostolic Letter of the Supreme Pontiff Reaffirming and Updating the Previous Regulations Respecting the Oriental Churches (Leo XIII – Nov. 30, 1894)
Postquam Catholici – Letter of the Supreme Pontiff to the Archbishop of Tarragona on the Success of the Recent Spanish Congress (Leo XIII – Dec. 10, 1894)
Christi Nomen – Encyclical Letter of the Supreme Pontiff Directing Contributions to the Society for the Propagation of the Faith on Behalf of the Eastern Churches (Leo XIII – Dec. 24, 1894)
1895
Longinqua – Encyclical Letter of the Supreme Pontiff On Catholicism in America (Leo XIII – Jan. 6, 1895)
Amantissimae Voluntatis – Apostolic Letter of the Supreme Pontiff to the English People (Leo XIII – Apr. 14, 1895)
Provida Matris – Brief of the Supreme Pontiff Announcing a Perpetual Pentecost Indulgence For Special Prayers Addressed to the Holy Spirit (Leo XIII – May 5, 1895)
Quenam Ex Catholicis – Letter of the Supreme Pontiff Reaffirming that Italian Catholics Must Avoid Participation in Political Elections (Leo XIII – May 14, 1895)
Permoti Nos – Encyclical Letter of the Supreme Pontiff Ordering Concord in Addressing the Social Question in Belgium (Leo XIII – July 10, 1895)
Adiutricem – Encyclical Letter of the Supreme Pontiff On the Power and the Use of the Rosary to Reconcile Separated Nations to the Church (Leo XIII – Sept. 5, 1895)
Le Insolite – Letter of the Supreme Pontiff to Cardinal Secretary of State Mariano Rampollo on the Ongoing Work of the Masonic Sects to Establish Their Third Rome (Leo XIII – Oct. 8, 1895)
1896
Magni Commemoratio – Brief of the Supreme Pontiff Granting an Indulgence to the Celebration of the XIV Centenary of the Baptism of King Clovis of the Franks (Leo XIII – Jan. 8, 1896)
Con Vivissima – Allocution of the Supreme Pontiff on the Progress of the Church in the East (Leo XIII – Mar. 2, 1896)
Insignes – Encyclical Letter of the Supreme Pontiff On the Benefits of the Catholic Religion to the State on the Occassion of the Hungarian Millennium (Leo XIII – May 1, 1896)
Placuit Tibi – Letter of the Supreme Pontiff to the Emperor of Ethiopia Asking for the Release of the Prisoners of War (Leo XIII – May 11, 1896)
Satis Cognitum – Encyclical Letter of the Supreme Pontiff On The Unity of the Church (Leo XIII – June 29, 1896)
Apostolicae Curae – Sep. 15, 1896
Fidentem Piumque Animum – Encyclical Letter of the Supreme Pontiff Insisting Upon and Confirming the Pleasant and Advantageous Effects of the Proper Employment of the Rosary (Leo XIII – Sept. 20, 1896)
La Tarda Eta – Allocution of the Supreme Pontiff to the Sacred College of Cardinals During the Presentation of Christmas Greetings (Leo XIII – Dec. 22, 1896)
1897
Officiorum ac Munerum – The Prohibition and Censorship of Books (Leo XIII – 1897)
Trans Oceanum – Apostolic Letter of the Supreme Pontiff Granting Privileges to the Dioceses and Jurisdictions of Latin America (Leo XIII – April 18, 1897)
Divinum Illud Munus – Encyclical Letter of the Supreme Pontiff On the Holy Spirit (Leo XIII – May 9, 1897)
Militantis Ecclesiae – Encyclical Letter of the Supreme Pontiff On St. Peter Canisius and On Education in Austria, Germany, and Switzerland (Leo XIII – Aug 1, 1897)
Augustissimae Virginis Mariae – Encyclical Letter of the Supreme Pontiff On the Confraternity of the Holy Rosary (Leo XIII – Sept. 12, 1897)
Affari Vos – Encyclical Letter of the Supreme Pontiff On the Manitoba School Question (Leo XIII – Dec. 18, 1897)
1898
Quum Adeo – Letter of the Supreme Pontiff to the Cardinal Archbishop of Milan Lamenting the Civil Uprisings (Leo XIII – May 22, 1898)
Ea Animi Sollicitudo – Motu Proprio of the Supreme Pontiff Suppressing the Vacabili (Leo XIII – July 4, 1898)
Caritatis Studium – Encyclical Letter of the Supreme Pontiff On Reclaiming the Separated Brethren for the Church in Scotland (Leo XIII – July 25, 1898)
Spesse Volte – Encyclical Letter of the Supreme Pontiff On the History and Recent Suppression of Catholic Charitable Institutions in Italy (Leo XIII – Aug. 5, 1898)
Quam Religiosa – Encyclical Letter of the Supreme Pontiff On the Disobediently Disseminated Law in Peru Introducing Civil Marriage (Leo XIII – Aug. 16, 1898)
Maximo Cum Animi – Letter of the Supreme Pontiff Praising the Formation of a French National Committee For the Preservation or Defense of the French Protectorate in the Holy Land (Leo XIII – Aug. 20, 1898)
Diuturni Temporis – Encyclical Letter of the Supreme Pontiff Announcing a Projected Constitution Concerning the Privileges and Favors Enjoyed By the Members of the Rosary Sodality (Leo XIII – Sept. 5, 1898)
Ubi Primum – Apostolic Constitution of the Supreme Pontiff On the Laws, Rights, and Privileges of the Confraternity of the Most Holy Rosary (Leo XIII – Oct. 2, 1898)
Quum Diuturnum – Encyclical Letter of the Supreme Pontiff Announcing the Latin American Bishops’ Plenary Council (Leo XIII – Dec. 25, 1898)
1899
Properante Ad Exitum – Letter of the Supreme Pontiff Promulgating the Jubilee of 1900 and Explaining How to Profit From Visiting the Sacred City (Leo XIII – May 11, 1899)
Annum Sacrum – Encyclical Letter of the Supreme Pontiff Ordaining Certain Prayers and the Consecration to the Sacred Heart of Jesus (Leo XIII – May 25, 1899)
Nous Le Pouvons – Letter of the Supreme Pontiff to H MR. Wilhelmina, Queen of the Netherlands on the Conference for Peace (Leo XIII – May 29, 1899)
Depuis Le Jour – Encyclical Letter of the Supreme Pontiff On the Education and Ministry of the Clergy in France (Leo XIII – Sept. 8, 1899)
Paternae – Encyclical Letter of the Supreme Pontiff On the Education of Clergy in Brazil (Leo XIII – Sept. 18, 1899)
1900
I Luttuosi Avvenimenti – Letter of the Supreme Pontiff On Prayers Imploring Divine Clemency on the Agitated Populations in China (Leo XIII – July 16, 1900)
Omnibus Compertum – Encyclical Letter of the Supreme Pontiff Consolidating the Agreement Among the Greek Melchites (Leo XIII – July 21, 1900)
Gia Fin Dagli Esordii – Letter of the Supreme Pontiff On the Strengthening of the “Preservation of the Faith” (Leo XIII – Aug. 19, 1900)
Tametsi Futura Prospicientibus – Encyclical Letter of the Supreme Pontiff On Jesus Christ the Redeemer (Leo XIII – Nov. 1, 1900)
Au Milieu Des Consolations – Letter of the Supreme Pontiff Defending Religious Congregations in France (Leo XIII – Dec. 23, 1900)
1901
Graves De Communi Re – Encyclical Letter of the Supreme Pontiff On Christian Democracy (Leo XIII – Jan. 18, 1901)
Le Nostre Ferme Speranzi – Letter of the Supreme Pontiff Praising the Work of the Association of the Perpetual Rosary in Italy (Leo XIII – Mar. 26, 1901)
Gravissimas – Encyclical Letter of the Supreme Pontiff to the Bishops of Portugal On Dealing With the Recent Decrees Against Religious Societies (Leo XIII – May 16, 1901)
Al Compimento Delle Riformi – Chirograph of the Supreme Pontiff Concerning the Vacabili (Leo XIII – June 11, 1901)
En Tout Temps – Letter of the Supreme Pontiff Strengthening the Religious Families in their Persecutions (Leo XIII – June 29, 1901)
Reputantibus – Encyclical Letter of the Supreme Pontiff On the Language Question in Bohemia (Leo XIII – Aug. 20, 1901)
Urbanitatis Veteris – Encyclical Letter of the Supreme Pontiff On the Foundation of a Seminary in Athens (Leo XIII – Nov. 20, 1901)
1902
Vigesimo Quinto Anno – Apostolic Letter of the Supreme Pontiff Reviewing the War Against the Church and Directing the Catholic Response (Leo XIII – Mar. 19, 1902)
In Amplissimo – Encyclical Letter of the Supreme Pontiff Praising the Action of the Bishops of the United States of North America in Advancing the Catholic Religion in Spite of Being Shown No Special Favor By the Law of the Land (Leo XIII – Apr. 15, 1902)
Quod Votis – Encyclical Letter of the Supreme Pontiff On the Proposed Catholic University in Austria (Leo XIII – Apr. 30, 1902)
Mirae Caritatis – Encyclical Letter of the Supreme Pontiff On the Holy Eucharist (Leo XIII – May 28, 1902)
Vigilantiae Studiique – Apostolic Letter of the Supreme Pontiff Establishing the Council For the Promotion of Biblical Sciences (Leo XIII – Oct. 30, 1902)
Quae Ad Nos – Encyclical Letter of the Supreme Pontiff On the Departure of Large Numbers From the Rites and Practices of Catholicism in Bohemia and Moravia (Leo XIII – Nov. 22, 1902)
Fin Dal Principio – Encyclical Letter of the Supreme Pontiff to the Bishops of Italy On the Education of the Clergy (Leo XIII – Dec. 8, 1902)
Dum Multa – Encyclical Letter of the Supreme Pontiff Condemning the So-Called Civil Marriage Laws Recently Enacted in Ecuador (Leo XIII – Dec. 24, 1902)
1903
Da Molte Parti – Apostolic Letter of the Supreme Pontiff Forming a Cardinal’s Commission to Direct the Fiftieth Anniversary Celebrations of the Dominican Definition of the Immaculate Conception of the Virgin Mother of God (Leo XIII – May 26, 1903)
Praestans Fidei – Letter of the Supreme Pontiff Rejoicing Over the Crowning of Our Lady of the Dunes at Dunkirk (Leo XIII – June 10, 1903)
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