Written by Guide Catholic
Pope Ven. Pius XII (260º): Vatican I & Dogma — Complete Guide
Pontificate: 2 March 1939–9 October 1958 · Origin: Rome, Italy) · Birth name: Pius Duodecimus
Ven. Pius XII was the 260th pope of the Catholic Church, reigning 2 March 1939–9 October 1958 during the modern papacy. Published the Humani generis(1950), the first encyclical to specifically refer to evolution and take a neutral position in regard to human evolution.
Who Was Pope Ven. Pius XII?
Pope Ven. Pius XII — 260º in the Catholic list — reigned 2 March 1939–9 October 1958 during the modern papacy. Search interest often clusters around Vatican I & Dogma. Italian citizen; first pope born after the unification of Italy. This Guide Catholic profile gathers background, major acts, and legacy so you can read Ven. Pius XII beside neighboring pontiffs.
Early Life & Background
Before election he was known as Eugenio Maria Giuseppe Giovanni Pacelli. Born 2 March 1876 Rome, Kingdom of Italy, he entered a world shaped by politics and piety very different from today's global Church.
Historical Context
Ven. Pius XII (#undefined) served while industry, world wars, the loss of the Papal States, and Vatican councils remade how Rome speaks to a mass society. Credited with intervening for peace during World War II; controversial for his reactions to the Holocaust.
Pontificate & Key Events
The pontificate (2 March 1939–9 October 1958) centered on governance during the modern papacy. Invoked papal infallibility in the apostolic constitution Munificentissimus Deus, defining the dogma of the Assumption.
Papal Acts & Achievements
Acts associated with Ven. Pius XII (#260, 2 March 1939–9 October 1958) still draw historians and Catholics who want more than a one-line summary. His reign remains a link in the succession now counted at 267 popes. Papal motto: Opus justitiae pax ("The work of justice [shall be] peace").
Key Highlights
- 260th pope of the Catholic Church
- Pontificate: 2 March 1939–9 October 1958
- Published the Humani generis(1950), the first encyclical to specifically refer to evolution and take a neutral position in regard
- Shepherded the Church during the modern papacy
- Successor of St. Peter in the official Catholic list
Legacy in the Catholic Church
Ven. Pius XII remains pope 260º in the Annuario Pontificio. Set against the modern papacy, Ven. Pius XII's choices show both the limits of any one pontiff and the continuity of the office he held.
Why Catholics Study This Pope Today
Reading Ven. Pius XII as pope 260º (2 March 1939–9 October 1958) is a way to study how Rome answered the crises of the modern papacy. Start with the concrete record: Published the Humani generis(1950), the first encyclical to specifically refer to evolution and take a neutral position in regard to human evolution. Where bulls, conciliar acts, or encyclicals survive from this reign, they repay readers who want primary sources rather than summaries alone. Then step back to the full list of 267 popes to see where Ven. Pius XII sits between crisis and consolidation.
Place in the Line of Succession
Ven. Pius XII followed Pope Pius XI (259º, 6 February 1922–10 February 1939) after a transition shaped by the politics and piety of their shared century. He was followed by Pope St. John (261º, 28 October 1958–3 June 1963), whose biography continues the chain on Guide Catholic. For the full chronological map, see our complete list of all 267 popes — then read neighboring biographies for contrast, not only continuity.