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Encyclicals

Ad Extremas (Seminaries for Native Clergy) June 24, 1893
Adiutricem (On the Rosary) September 5, 1895
Aeterni Patris (On the Restoration of Christian Philosophy) August 4, 1879
Affari Vos (On the Manitoba School Question) December 8, 1897
Annum Sacrum (Consecration to the Sacred Heart) May 25, 1899
Apostolicae Curae (On the Nullity of Anglican Orders) September 15, 1896 [Bull]
Arcanum (On Christian Marriage) February 10, 1880
Au Milieu Des Sollicitudes (On the Church and State in France) February 16, 1892
Augustissimae Virginis Mariae (On the Confraternity of the Holy Rosary) September 12, 1897
Auspicato Concessum (On St. Francis of Assisi) September 17, 1882
Caritatis Studium (On the Church in Scotland) July 25, 1898
Catholicae Ecclesiae (On Slavery in the Missions) November 20, 1890
Christi Nomen (On Propogation of the Faith and Eastern Churches) December 24, 1894
Constanti Hungarorum (On the Church in Hungary) September 2, 1893
Cum Multa (On Conditions in Spain) December 8, 1882
Custodi Di Quella Fede (On Freemasonry) December 8, 1892
Dall'alto Dell'apostolico Seggio (On Freemasonry in Italy) October 15, 1890
Depuis Le Jour (On the Education of the Clergy) September 8, 1899
Diuturni Temporis (On the Rosary) September 5, 1898
Diuturnum (On the Origin of Civil Power) June 29, 1881
Divinum Illud Munus (On the Holy Spirit Divinum) May 9, 1897
Dum Multa (Marriage Legislation) December 24, 1902
Etsi Cunctas (On the Church in Ireland) December 21, 1888
Etsi Nos (On Conditions in Italy) February 15, 1882
Exeunte Iam Anno (On Right Ordering of Christian Life) December 25, 1888
Fidentem Piumque Animum (On the Rosary) September 20, 1896
Fin Dal Principio (On the Education of the Clergy) December 8, 1902
Grande Munus (On Saints Cyril and Methodius) September 30, 1880
Graves De Communi Re (On Christian Democracy) January 18, 1901
Gravissimas (On Religious Orders in Portugal) May 16, 1901
Humanum Genus (On Freemasonry) April 20, 1884
Iampridem (On Catholicism in Germany) January 6, 1886
Immortale Dei (On the Christian Constitution of States) November 1, 1885
In Amplissimo (On the Church in the United States) April 15, 1902
In Ipso (On Episcopal Reunions in Austria) March 3, 1891
In Plurimis (On the Abolition of Slavery) May 5, 1888
Inimica Vis (On Freemasonry) December 8, 1892
Inscrutabili Dei Consilio (On the Evils of Society) April 21, 1878
Insignes (On the Hungarian Millenium) May 1, 1896
Iucunda Semper Expectatione (On the Rosary) September 8, 1894
Laetitiae Sanctae (Commending Devotion to the Rosary) September 8, 1893
Libertas (On the Nature of Human Liberty) June 20, 1888
Licet Multa (On Catholics in Belgium) August 3, 1881
Litteras A Vobis (On the Clergy in Brasil) July 2, 1894
Longinqua (On Catholicism in the United States) January 6, 1895
Magnae Dei Matris (On the Rosary) September 8, 1892
Magni Nobis (On the Catholic University of America) March 7, 1889
Militantis Ecclesiae (On St. Peter Canisius) August 1, 1897
Mirae Caritatis (On the Holy Eucharist) May 28, 1902
Misericors Dei Filius: (Constitution On the Law of the Franciscan third Order secular) May 30, 1883 A. D. English / Latin
Nobilissima Gallorum Gens (On the Religious Question in France) February 8, 1884
Octobri Mense (On the Rosary) September 22, 1891
Officio Sanctissimo (On the Church in Bavaria) December 22, 1887
Omnibus Compertum (On Unity Among the Greek) July 21, 1900
Orientalium Dignitas (On the Churches of the East) November 30, 1894
Pastoralis Officii (On the Morality of Deuling) September 12, 1891
Pastoralis (On Religious Union) June 25, 1891
Paternae (On the Education of the Clergy) September 18, 1899
Pergrata (On the Church in Portugal) September 14, 1886
Permoti Nos (On Social Conditions in Belgium) July 10, 1895
Praeclara Gratulationis Publicae (The Reunion of Christendom) June 20, 1894 [External source]
Providentissimus Deus (On the Study of Holy Scripture) November 18, 1893
Quae Ad Nos (On the Church in Bohemia and Moravia) November 22, 1902
Quam Aerumnosa (On Italian Immigrants) December 10, 1888
Quam Religiosa (On Civil Marriage Law) August 16, 1898
Quamquam Pluries (On Devotion to St. Joseph) August 15, 1889
Quarto Abeunte Saeculo (On Christopher Columbus) July 16, 1892
Quod Anniversarius (On His Sacerdotal Jubilee) April 1, 1888
Quod Apostolici Muneris (On Socialism) December 28, 1878
Quod Auctoritate (Proclaiming a Jubilee) December 22, 1885
Quod Multum (On the Liberty of the Church) August 22, 1886
Quod Votis (On the Proposed Catholic University) April 30, 1902
Quum Diuturnum (On the Latin American Bishops' Plenary Council) December 25, 1898
Reputantiubus (On the Language Question in Bohemia) August 20, 1901
Rerum Novarum (On Capitol and Labor) May 15, 1891
Saepe Nos (On Boycotting in Ireland) June 24, 1888
Sancta Dei Civitas (On Mission Societies) December 3, 1880
Sapientiae Christianae (On Christians as Citizens) January 10, 1890
Satis Cognitum (On the Unity of the Church) June 29, 1896
Spectata Fides (On Christian Education) November 27, 1885
Spesse Volte (On the Suppression of Catholic Institutions) August 5, 1898
Superiore Anno (On the Recitation of the Rosary) August 30, 1884
Supremi Apostolatus Officio (On Devotion to the Rosary) September 1, 1883
Tametsi Futura Prospicientibus (On Jesus Christ the Redeemer) November 1, 1900
Testem Benevolentiae Nostrae (Virtue, Nature and Grace, and Americanism) January 22, 1899
Urbanitatis Veteris (On the Foundation of a Seminary in Athens) November 20, 1901
Vi E Ben Noto (On the Rosary and Public Life) September 20, 1887

We are gathering together papal encyclicals and the writings of various Popes dating back to 1226 from Pope Honorius III. The first link offers some history on Pope Leo XIII and the second brings you to all his encyclicals.

Some wrote prolifically and have produced many documents, and much depended on the duration of the reign of each Pope. Pope John Paul II was one of the longest reigning Popes in history and has written much.