Pope St. John XXIII (261º): Vatican II, Pacem in Terris & Good Pope John
Pontificate: 28 October 1958–3 June 1963
St. John was the 261st pope of the Catholic Church, reigning 28 October 1958–3 June 1963 during the contemporary Catholic Church. Intervened for peace during the Cuban Missile Crisis(1962); issued the encyclical Pacem in terris(1963) on peace and nuclear disarmament. The Catholic Church venerates him as a saint.
Who Was Pope John?
This biography of St. John (261º) covers background, major events, and legacy in the line of St. Peter. Common search topics include Vatican II. During the contemporary Catholic Church, the Bishop of Rome exercised teaching, sanctifying, and governing authority for the universal Church. Catholics honor him as a saint whose intercession remains available to the faithful.
Early Life & Background
Before election he was known as Angelo Giuseppe Roncalli. Born 25 November 1881 Sotto il Monte, Kingdom of Italy, he entered a world shaped by politics and piety very different from today's global Church.
Historical Context
John leads (or led) the Church in the contemporary era, when over a billion Catholics look to Rome for unity while the papacy faces globalization, secularization, digital media, and rapid social change. Opened the Second Vatican Council(1962).
Pontificate & Key Events
The pontificate (28 October 1958–3 June 1963) centered on governance during the contemporary Catholic Church. Called the "Good Pope John".
Papal Acts & Achievements
John left a distinct mark through decisions that historians still debate and Catholics still study. His reign contributed to the continuous apostolic succession now numbering 267 popes. Papal motto: Obedientia et pax ("Obedience and peace").
Key Highlights
- 261st pope of the Catholic Church
- Pontificate: 28 October 1958–3 June 1963
- Venerated as a saint in the Catholic Church
- Opened the Second Vatican Council(1962).
- Intervened for peace during the Cuban Missile Crisis(1962); issued the encyclical Pacem in terris(1963) on peace and nuclear disar
Legacy in the Catholic Church
St. John remains pope 261º in the Annuario Pontificio. The Church venerates his feast and holds up his virtues for imitation. Read against the contemporary Catholic Church, his pontificate shows how Providence works through imperfect ministers without abandoning the Barque of Peter.
Why Catholics Study This Pope Today
Studying St. John helps Catholics see how the Holy Spirit guided the Church through the contemporary Catholic Church — with human weakness and grace intertwined. You may ask John for intercession and look up his feast in the Roman calendar or Martyrology. Primary sources from this pontificate — bulls, conciliar acts, or encyclicals — reward readers who want depth beyond summaries. Place this pope in context using our chronological list of all 267 popes and the biographies of his immediate predecessor and successor linked below.
Place in the Line of Succession
St. John followed Pope Ven. Pius XII (260º) in the unbroken line of apostolic succession from St. Peter. Upon his death or resignation, he was succeeded by Pope St. Paul VI (262º), who continued the mission of shepherding the universal Church. Explore the full chronological chain in our complete list of all 267 popes, or read the biographies of neighboring pontiffs linked below.