Author:Leo XIII

Leo XIII
(1810–1903)

Leo XIII

Works by Leo XIII

Compilations

• The Great Encyclical Letters of Pope Leo XIII (1903)

Encyclical Letters

No.	Title (Latin or Italian)	Title (English translation)	Subject	Date
1.	Inscrutabili Dei Consilio	By God's Unsearchable Design	On the Evils of Society	21 April 1878
2.	Quod Apostolici Muneris	Which Apostolic Duty	On Socialism	28 December 1878
3.	Aeterni Patris	Of the Eternal Father	On the Restoration of Christian Philosophy	4 August 1879
4.	Arcanum divinae sapientia	The Mystery of Divine Wisdom	On Christian Marriage	10 February 1880
5.	Grande Munus	The Great Duty	On Saints Cyril and Methodius	30 September 1880
6.	Sancta Dei Civitas	The Holy City of God	On Mission Societies	3 December 1880
7.	Diuturnum	Long-lasting	On the Origin of Civil Power	29 June 1881
8.	Licet Multa	Although Many	On Catholics in Belgium	3 August 1881
9.	Etsi Nos	Even We	On Conditions in Italy	15 February 1882
10.	Auspicato Concessum	A Happy Circumstance	On St. Francis of Assisi	17 September 1882
11.	Cum Multa	With Many	On Conditions in Spain	8 December 1882
12.	Supremi Apostolatus Officio	The Supreme Apostolic Office	On Devotion to the Rosary	1 September 1883
13.	Nobilissima Gallorum Gens	The Most Noble People of France	On the Religious Question in France	8 February 1884
14.	Humanum Genus	The Human People	On Freemasonry	20 April 1884
15.	Superiore Anno	Last Year	On the Recitation of the Rosary	30 August 1884
16.	Immortale Dei	Immortal God	On the Christian Constitution of States	1 November 1885
17.	Spectata Fides	Observed Faith	On Christian Education	27 November 1885
18.	Quod Auctoritate	Which by Authority	Proclaiming a Jubilee	22 December 1885
19.	Iampridem	Long Ago	On Catholicism in Germany	6 January 1886
20.	Quod Multum	Which for Many	On the Liberty of the Church	22 August 1886
21.	Pergrata	Most Pleasing	On the Church in Portugal	14 September 1886
22.	Vi È Ben Noto	It Is Well Known to You	On the Rosary and Public Life	20 September 1887
23.	Officio Sanctissimo	The Holiest Duty	On the Church in Bavaria	22 December 1887
24.	Quod Anniversarius	Which Anniversiary	On His Sacerdotal Jubilee	1 April 1888
25.	In Plurimis	Among the Many	On the Abolition of Slavery	5 May 1888
26.	Saepe Nos	We Often	On Boycotting in Ireland	24 June 1888
27.	Libertas praestantissimum donum	Liberty, the Most Excellent Gift	On the Nature of Human Liberty	20 June 1888
28.	Quam Aerumnosa	How Troublesome	On Italian Immigrants	10 December 1888
29.	Etsi Cunctas	Although All	On the Church in Ireland	21 December 1888
30.	Exeunte Iam Anno	Already at the End of the Year	On Right Ordering of Christian Life	25 December 1888
31.	Magni Nobis	Great to Us	On The Catholic University of America	7 March 1889
32.	Quamquam Pluries	Although Frequently	On Devotion to St. Joseph	15 August 1889
33.	Sapientiae Christianae	Of Christian Wisdom	On Christians as Citizens	10 January 1890
34.	Dall'alto dell'Apostolico Seggio	From the Height of the Apostolic Seat	On Freemasonry in Italy	15 October 1890
35.	Catholicae Ecclesiae	Of the Catholic Church	On Slavery in the Missions	20 November 1890
36.	In Ipso	In Itself	On Episcopal Reunions in Austria	3 March 1891
37.	Rerum Novarum	New Things	On Capitol and Labour	15 May 1891
38.	Pastoralis	Of Pastoral Things	On Religious Union	25 June 1891
39.	Pastoralis Officii	Of the Pastoral Office	On the Morality of Duelling	12 September 1891
40.	Octobri Mense	The Month of October	On the Rosary	22 September 1891
41.	Au Milieu Des Sollicitudes	Amid the Solicitudes	On the Church and State in France	16 February 1892
42.	Quarto Abeunte Saeculo	The Fourth Century Having Passed	On Christopher Columbus	16 July 1892
43.	Magnae Dei Matris	Of the Great Mother of God	On the Rosary	8 September 1892
44.	Custodi Di Quella Fede	Guards of That Faith	On Freemasonry	8 December 1892
45.	Inimica Vis	The Hostile Force	On Freemasonry	8 December 1892
46.	Ad Extremas	To the Farthest	Seminaries for Native Clergy	24 June 1893
47.	Constanti Hungarorum	The Hungarians' Loyal	On the Church in Hungary	2 September 1893
48.	Laetitiae Sanctae	Of Holy Praise	Commending Devotion to the Rosary	8 September 1893
49.	Providentissimus Deus	The Most Provident God	On the Study of Holy Scripture	18 November 1893
50.	Praeclara Gratulationis Publica	The Public Rejoicing's Splendid	The Reunion of Christendom	20 June 1894
51.	Litteras A Vobis	Your Letter	On the Clergy in Brasil	2 July 1894
52.	Iucunda Semper Expectatione	Always with Delightful Expectation	On the Rosary	8 September 1894
53.	Orientalium Dignitas	The Dignity of the Easterners	On the Churches of the East	30 November 1894
54.	Christi Nomen	The Name of Christ	On Propagation of the Faith and Eastern Churches	24 December 1894
55.	Longinqua	Extensive	On Catholicism in the United States	6 January 1895
56.	Permoti Nos	We, Influenced	On Social Conditions in Belgium	10 July 1895
57.	Adiutricem	Adjutrix	On the Rosary	5 September 1895
58.	Insignes	Eminent	On the Hungarian Millennium	1 May 1896
59.	Satis Cognitum	Sufficiently Well-Known	On the Unity of the Church	29 June 1896
60.	Fidentem Piumque Animum	Confidence and Devotion	On the Rosary	20 September 1896
61.	Divinum Illud Munus	That Divine Office	On the Holy Spirit	9 May 1897
62.	Militantis Ecclesiae	Of the Church Militant	On St. Peter Canisius	1 August 1897
63.	Augustissimae Virginis Mariae	Of the Most August Virgin Mary	On the Confraternity of the Holy Rosary	12 September 1897
64.	Affari Vos	Speak to You	On the Manitoba Schools Question	8 December 1897
65.	Caritatis Studium	Of the Studies of Charity	On the Church in Scotland	25 July 1898
66.	Spesse Volte	Many Times	On the Suppression of Catholic Institutions	5 August 1898
67.	Quam Religiosa	Which Religious	On Civil Marriage Law	16 August 1898
68.	Diuturni Temporis	Long Time	On the Rosary	5 September 1898
69.	Quum Diuturnum	When the Long	On the Latin American Bishops' Plenary Council	25 December 1898
70.	Testem Benevolentiae Nostrae	Witness to Our Goodwill	Virtue, Nature and Grace, and Americanism	22 January 1899
71.	Annum Sacrum	A Holy Year	Consecration to the Sacred Heart	25 May 1899
72.	Depuis Le Jour	Since the Day	On the Education of the Clergy	8 September 1899
73.	Paternae	Paternal	On the Education of the Clergy	18 September 1899
74.	Omnibus Compertum	Everyone Knows	On Unity Among the Greek	21 July 1900
75.	Tametsi Futura Prospicientibus	Although the Outlook on the Future	On Jesus Christ the Redeemer	1 November 1900
76.	Graves De Communi Re	Grave Regarding General Business	On Christian Democracy	18 January 1901
77.	Gravissimas	The Gravest	On Religious Orders in Portugal	16 May 1901
78.	Reputantibus	Reflecting	On the Language Question in Bohemia	20 August 1901
79.	Urbanitatis Veteris	Of Ancient City-Living	On the Foundation of a Seminary in Athens	20 November 1901
80.	In Amplissimo	In the Greatest	On the Church in the United States	15 April 1902
81.	Quod Votis	Which Undertaking	On the Proposed Catholic University	30 April 1902
82.	Mirae Caritatis	Of Wondrouts Love	On the Holy Eucharist	28 May 1902
83.	Quae Ad Nos	Which to Us	On the Church in Bohemia and Moravia	22 November 1902
84.	Fin Dal Principio	Since the Beginning	On the Education of the Clergy	8 December 1902
85.	Dum Multa	While with Much	Marriage Legislation	24 December 1902

Apostolic Constitutions

No.	Title (Latin or Italian)	Title (English translation)	Subject	Date
1.	Romanos Pontifices	The Roman Pontiffs	On British Bishops	13 May 1881
2.	Misericors Dei Filius	The Merciful Son of God	On Franciscan Tertiaries	30 May 1883
3.	Iamdudum pars	Long Ago the Part	On the Great Price of Quebec	2 February 1889
4.	Officiorum ac munerum	Of Duties and Obligation	On the Prohibition and Censorship of Books	25 January 1897
5.	Felicitate quadam	With a Certain Happiness	On Franciscan Orders	4 October 1897
6.	Ubi primum	Where First	On Rosary Confraternities	2 October 1898
7.	Aeterni Pastoris	Of the Eternal Pastor	On the Jubilee	24 October 1899
8.	Conditae a Christo	Founded by Christ	On Religious Orders	8 December 1900

Apostolic Letters

• To the English People
• True and False Americanism in Religion
• Apostolicae Curae - Anglican Orders (15th September 1896)
• The Holy Scriptures ; The Biblical Commission
• Review of His Pontificate
• The Church in the Philippines

Other letters

• The Religious Congregations in France
• Congratulations to the American Hierarchy

Works about Leo

• "Pope Leo XIII," in Catholic Encyclopedia, (ed.) by Charles G. Herbermann and others, New York: The Encyclopaedia Press (1913)
• "Leo (popes)/Leo XIII," in Encyclopædia Britannica (11th ed., 1911)
• "The Portrait I did not Paint", a biographical portrait (of sorts) by John McLure Hamilton from Men I Have Painted (1921).

Letters to Leo

• Theodosius, the metropolitan of Skopje, to Pope Leo XIII