Encyclicals (Benedict XV) Ad Beatissimi Apostolorum – Encyclical Letter of the Supreme Pontiff Considering the Causes of the Serious Unrest Pervading the Whole of Human Society and Appealing for Peace (Benedict XV – Nov. 1, 1914) Humani Generis Redemptionem – Encyclical Letter of the Supreme Pontiff On Preaching the Word of God (Benedict XV – Jun. 15, 1917) Quod Iam Diu – Encyclical Letter of the Supreme Pontiff On the Future Peace Conference (Benedict XV – Dec. 1, 1918) In Hac Tanta – Encyclical Letter of the Supreme Pontiff on St. Boniface (Benedict XV – May 14, 1919) Paterno Iam Diu – Encyclical Letter of the Supreme Pontiff On the Children of Europe Debilitated by the Sanguinary Conflict Which Has Desolated Almost the Whole World (Benedict XV – Nov. 24, 1919) Pacem, Dei Munus Pulcherrimum – Encyclical Letter of the Supreme Pontiff On Peace and Christian Reconciliation (Benedict XV – May 23, 1920) Spiritus Paraclitus – On The Fifteenth Centenary of the Death of St. Jerome (Benedict XV – Sept. 15, 1920) Principi Apostolorum Petro – Encyclical Letter of the Supreme Pontiff On St. Ephrem the Syrian (Benedict XV – Oct. 5, 1920) Annus Iam Plenus – Encyclical Letter of the Supreme Pontiff On Children of Central Europe (Benedict XV – Dec. 1, 1920) Sacra Propediem – Encyclical Letter of the Supreme Pontiff Presenting the True Moral Physiognomy of St. Francis of Assisi and Promoting His Third Order (Benedict XV – Feast of the Epiphany, 1921) In Praeclara Summorum – Encyclical Letter of the Supreme Pontiff Initiating the Cycle of the Centenary Celebrations of Dante Alighieri (Benedict XV – April 30, 1921) Fausto Appetente Die – Encyclical Letter of the Supreme Pontiff On St. Dominic (Benedict XV – June 29, 1921)