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Amantissimi Redemptoris
On Priests and the Care of Souls. Encyclical promulgated 3 May, 1858.
Amantissimus
On the Care of Churches. Establishes a Congregation for Eastern Rites. Encyclical promulgated 8 April, 1862.
Apostolicae Nostrae Caritatis
Urging Prayers for Peace. Encyclical promulgated 1 August 1854.
Beneficia Dei
Encyclical promulgated 4 June, 1871, commemorating the 25th anniversary of his pontificate.
Cum nuper
Care for Clerics. Written to the Sicilian bishops. Urges a high standard of morality for clergy and laity alike. Encyclical promulgated 20 January, 1858.
Cum Sancta Mater Ecclesia
Pleading for Public Prayer. Urges bishops and the faithful to beg God "banish war to the very ends of the earth." Encyclical promulgated 27 April, 1859.
Etsi multa
Denounces actions against the Church by the governments of Italy, Germany, and Switzerland. Encyclical promulgated 21 November, 1873.
Exultavit cor nostrum
On the Effects of the Jubilee. Encyclical promulgated 21 November, 1851.
Graves ac diuturnae
On the Church in Switzerland. Condemns the Old Catholics and anti-Catholic marriage laws. Encyclical promulgated 23 March, 1875.
Gravibus Ecclesiae
Proclaims a Jubilee Year for 1875. Encyclical promulgated 24 December, 1874.
Incredibili
On persecution in New Granada. Encyclical promulgated 17 September, 1863.
Ineffabilis Deus
Defines the Immaculate Conception infallibly as dogma. Apostolic Constitution issued by Pope Pius IX on 8 December, 1854.
Levate
On the Afflictions of the Church. Decries attacks on the Church in Russia, Poland, and Italy. Encyclical promulgated 21 October, 1867.
Maximae quidem
On the Church in Bavaria. Encyclical promulgated 18 August, 1864.
Meridionali Americae
On the Seminary for Native Clergy. To the bishops of South America. Expresses joy at the increase in indigenous clergy and concern for their proper formation. Encyclical promulgated 30 September, 1865.
Neminem vestrum
On the Persecution of Armenians. Clarifies the current status of the Mechitharist monks, deplores dissension and schisms among Armenian Catholics. Encyclical promulgated 2 February, 1854.
Nemo certe ignorat
On Discipline for Clergy. Urges unity of the bishops of the British Isles, encourages the foundation of the Catholic University of Ireland. Encyclical promulgated 25 March, 1852.
Nostis et nobiscum
On the Church in the Pontifical States. Encyclical promulgated 8 December, 1849.
Nullis certe verbis
On the Need for Civil Sovereignty. Rejects Napoleon III's advice that Pius IX surrender the Papal States. Encyclical promulgated 19 January, 1860.
Omnem sollicitudinem
On the Greek-Ruthenian Rite. Forbids any changes be made to Eastern Catholic liturgies, and in particular to the Ruthenian Rite. Encyclical promulgated 13 May, 1874.
On Episcopal Meetings
To the bishops of the Austrian Empire. Praises the faith of Emperor Franz Josef, urges the bishops to hold councils and provincial and diocesan synods. Encyclical promulgated 5 November, 1855.
Optime noscitis
On the Proposed Catholic University of Ireland. Tells the bishops to go forward with their plan, and approves their choice of John Henry Newman as rector. Encyclical promulgated 20 March, 1854.
Praedecessores nostros
On Aid for Ireland. Calls on the bishops of the world to proclaim three days of public prayer for Ireland, and also to collect donations to financially support the Irish, who were then suffering from a worsening famine and widespread disease. Encyclical promulgated 25 March, 1847.
Probe noscitis venerabiles
On the Discipline for Clergy. To the Spanish bishops, about proper formation of clergy. Encyclical promulgated 17 May, 1852.
Quae in patriarchatu
On the Church in Chaldea. Encyclical promulgated 16 November, 1872.
Quanta Cura
Condemning Current Errors. The fatal opinions include the political-religious philosophy of naturalism, promotion of an extreme form of religious liberty, and atheistic communism and socialism. Encyclical promulgated 8 December, 1864.
Quanto conficiamur moerore
On Promotion of False Doctrines. Encyclical promulgated 10 August, 1863.
Quartus supra
On the Church in Armenia. Quite a long letter on the nature of schism, and warning against new schismatics attempting to deceive Armenian Catholics. Encyclical promulgated 6 January, 1873.
Qui nuper
On Pontifical States. Notifies bishops of rebellion in the Papal States, asks for prayers. Encyclical promulgated 18 June, 1859.
Qui pluribus
On Faith and Religion. Pius IX's first encyclical, promulgated 9 November, 1846.
Quod nunquam
On the Church in Prussia. Condemns recent anti-Catholic laws. Encyclical promulgated 5 February, 1875.
Respicientes
Protesting the Taking of the Pontifical States. Encyclical promulgated 1 November, 1870.
Saepe venerabiles fratres
Thanksgiving for 25 Years of Pontificate. Encyclical promulgated 5 August, 1871.
Singulari quidem
On the Church in Austria. Encyclical promulgated 17 March, 1856.
Syllabus of Errors
Condemns various philosophies, religious attitudes, and opinions on the relation between Church and State. Issued in 1864.
Ubi nos
On the Pontifical States. Encyclical promulgated 15 May, 1871.
Ubi primum
On Discipline for Religious. Exhortation to members of religious orders. Announces the establishment of the Congregation for Religious. Encyclical promulgated 17 June, 1847.
Ubi primum
On the Immaculate Conception. Asks the bishops to pray about whether the Immaculate Conception should be defined as dogma. Encyclical promulgated 2 February, 1849.
Vix dum a nobis
On the Church in Austria. Expresses opposition to proposed legislation which asserts that the civil government has authority over the Church. Encyclical promulgated 7 March, 1874.