Apostolic Letters (Pius IX)

Multiplices Inter – Apostolic Letter of the Supreme Pontiff Condemning Certain Errors of Francisco de Paula Gonzalez Vigil from which the 1864 Syllabus of Errors draws condemned propositions 15, 21, 23, 30, 51, 54, 58, and 74 (Pius IX – June 10, 1851)

Tuas Libenter – Apostolic Letter to the Venerable Brother Gregory, Archbishop of Munich and Freising (Pius IX – 1863)

Meridionali Americae – On the Seminary for the Native Clergy (Pius IX – 1865)

Iam Vos Omnes (Pius IX – 1868)

Religiosas Regularium – Apostolic Letter of the Supreme Pontiff to Venerable Brother Antonio Giuseppe Pluym, Archbishop of Tiane (Pius IX – Feb. 23, 1870)

Non Sine Gravissimo – Apostolic Letter of the Supreme Pontiff to Venerable Brother Antonio Giuseppe, Archbishop of Tiene, Our Apostolic Delegate and of this Apostolic See in the City of Constantinople (Pius IX – Feb. 24, 1870)

Quod Impensiore – Apostolic Letter to the Beloved Armenian Catholic Sons of the Patriarchate of Cilicia (Pius IX – May 20, 1870)

Ecclesia Dei – Apostolic Letter to Cardinal Patrizi (Pius IX – March 2, 1871)

Costretti Nelle – Apostolic Letter to Cardinal Antonelli (Pius IX – June 16, 1872)

Dives in Misericordia Deus – Apostolic Letter to the Universal Church Proclaiming St. Francis de Sales a “Doctor of the Church” (Pius IX – 1877)