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Vi è Ben Noto
Addressed to the bishops of Italy. Begs them to encourage praying the rosary for the pope in his hour of need. Encyclical promulgated 20 September, 1887.
Supremi Apostolatus Officio
http://www.newadvent.org/library/docs_le13so.htm
Encyclical promulgated September 1, 1883. Testifies to the rosary's venerability and power, and exhorts the faithful to its frequent use.
Superiore Anno
http://www.newadvent.org/library/docs_le13sa.htm
On the recitation of the rosary. Previous year's October Marian devotions judged a success. Also mentions cholera epidemic then sweeping France and Italy. Encyclical promulgated 30 August, 1884.
Rerum Novarum
http://www.papalencyclicals.net/Leo13/l13rerum.htm
Encyclical on capital and labor, promulgated 15 May, 1891. The birth of modern Catholic social teaching, as the pope wrestles with the alienating effects of the Industrial Revolution. 82K.
Quod Apostolici Muneris
Encyclical on socialism. Promulgated 28 December, 1878. Condemns socialism, communism, and nihilism as a "wicked confederacy."
Quarto Abeunte Saeculo
http://www.papalencyclicals.net/Leo13/l13col.htm
Encyclical issued on the occasion of the Columbus Quadricentennial, in 1892. Paints Christopher Columbus as an exemplary Catholic motivated by a desire to advance the Christian faith.
Quamquam Pluries
http://www.papalencyclicals.net/Leo13/l13jos.htm
Encyclical on devotion to St. Joseph, promulgated on August 15, 1889.
Providentissimus Deus
http://www.intratext.com/X/ENG0381.HTM
Encyclical on the study of Holy Scripture, promulgated 18 November, 1893. Each chapter in its own file. With concordances and word frequency lists.
Providentissimus Deus
http://www.papalencyclicals.net/Leo13/l13provi.htm
Encyclical on the study of Holy Scripture. Promulgated 18 November, 1893. In former times, the Church had to contend with private interpretation, but now Catholics must also refute those who deny revelation. All in one file, 63K.
Paterna Caritas
Encyclical on reunion with Rome. Urges the Armenian Rite Catholics to be united with each other and to be shining examples of Christian life. Promulgated 25 July, 1888.
Octobri Mense
http://www.newadvent.org/library/docs_le13om.htm
On the Rosary. Encyclical promulgated 22 September, 1891.
Militantis Ecclesiae
Encyclical on St. Peter Canisius. Also praises learning. Promulgated 1 August, 1897.
Magnae Dei Matris
http://www.papalencyclicals.net/Leo13/l13ro2.htm
Encyclical promulgated 8 September, 1892. Commends the rosary for its power to increase love for Christ, and to inspire a virtuous life.
Laetitiae Sanctae
http://www.newadvent.org/library/docs_le13ls.htm
Says that meditation on each set of mysteries of the rosary remedies a specific danger in modern society. Encyclical promulgated 8 September, 1893.
Iucunda Semper Expectatione
On the Rosary. Also touches on Mary's role in pointing people to God. Encyclical promulgated 8 September, 1894.
Humanum Genus
http://www.trosch.org/bks/freemaso.htm
Encyclical condemning Freemasonry. Promulgated 20 April, 1884.
Grande Munus
http://www.papalencyclicals.net/Leo13/l13cym.htm
Encyclical on SS. Cyril and Methodius, promulgated 30 September, 1880.
Dall'alto dell'Apostolico Seggio
Encyclical on Freemasonry in Italy. Promulgated 15 October, 1890.
Custodi di quella fede
Encyclical addressed to the Italian people in particular, repeats condemnation of Freemasonry. Promulgated 8 December, 1892.
Auspicato Concessum
http://www.papalencyclicals.net/Leo13/l13frc.htm
On St. Francis of Assisi. Encyclical promulgated 17 September, 1882.
Augustissimae Virginis Mariae
Encyclical on the Confraternity of the Rosary. Promulgated 12 September, 1897.
Apostolicae Curae
http://www.papalencyclicals.net/Leo13/l13curae.htm
Papal bull on the nullity of Anglican orders, issued 18 September, 1896. Pronounces Anglican ordinations "absolutely null and utterly void."
Aeterni Patris
http://www.papalencyclicals.net/Leo13/l13cph.htm
On the Restoration of Christian Philosophy. Encyclical promulgated 4 August, 1879. Philosophy can be a powerful aid to apologetics and theology. Commends Scholasticism in particular.