Written by Guide Catholic
Pope St. John XXIII (261º): Vatican II, Pacem in Terris & Good Pope John
Pontificate: 28 October 1958–3 June 1963 · Origin: Sotto il Monte, Italy) · Birth name: Ioannes Vicesimus Tertius
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?
St. John holds the 261º place among Roman pontiffs, with a recorded reign of 28 October 1958–3 June 1963 inside the contemporary Catholic Church. Search interest often clusters around Vatican II. Opened the Second Vatican Council(1962). What follows is a structured biography — early life, context, acts, and succession — written for Catholics who want John in context. Catholics also honor him as a saint whose intercession remains part of living devotion.
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 (#undefined) leads or led more than a billion Catholics through globalization, secular pressure, and digital media that amplify every papal word.
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
Acts associated with John (#261, 28 October 1958–3 June 1963) 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: 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 still points to John's virtues for imitation. Set against the contemporary Catholic Church, John'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 John as pope 261º (28 October 1958–3 June 1963) is a way to study how Rome answered the crises of the contemporary Catholic Church. Because the Church venerates John, you may seek his intercession and check his feast in the Martyrology or local calendar. Start with the concrete record: Intervened for peace during the Cuban Missile Crisis(1962); issued the encyclical Pacem in terris(1963) on peace and nuclear disarmament. Opened the Second Vatican Council(1962). Where bulls, conciliar acts, or encyclicals survive from this reign, they repay readers who want primary sources rather than summaries alone. Use the neighboring pontiff links below to test whether John's reign looks unique or typical for the contemporary Catholic Church.
Place in the Line of Succession
St. John followed Pope Ven. Pius XII (260º, 2 March 1939–9 October 1958) after a transition shaped by the politics and piety of their shared century. He was followed by Pope St. Paul VI (262º, 21 June 1963–6 August 1978), 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.