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Timeline: Leo XIV and the Latin Mass

Key moments in the traditionalist Catholic world — councils and documents, communities and their founders, media launches and controversies — each with its sources.
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2025

  1. Landmark

    Cardinal Robert Prevost elected pope, taking the name Leo XIV

    On 8 May 2025, the second day of a conclave of 133 cardinal electors, Cardinal Robert Prevost was elected on the fourth ballot and took the name Leo XIV. Born in Chicago in 1955, an Augustinian who spent years as a missionary in Peru and had led the Dicastery for Bishops since 2023, he became the first pope from the United States.

    SourcesCardinal Robert Prevost, an American, elected pope for the first time in history (Bangor Daily News (AP))Cardinal Robert Prevost elected Pope, takes name Leo XIV (Catholic Diocese of Broken Bay)How the conclave voted in Pope Leo XIV (The Irish Post)

2021

  1. Landmark

    Francis issues Traditionis custodes, restricting the pre-1970 Mass

    The motu proprio declared the reformed liturgical books "the unique expression of the lex orandi of the Roman Rite", made the 1962 Missal subject to the diocesan bishop's authorisation, barred new groups, and abrogated earlier norms not in conformity. Francis's accompanying letter cited a 2020 consultation of bishops.

    SourcesApostolic Letter issued "Motu proprio" by the Supreme Pontiff Francis… (Holy See (vatican.va))Letter of the Holy Father to the Bishops of the whole world, that accompanies… (Holy See (vatican.va))Apostolic Letter issued "Motu proprio" by the Supreme Pontiff Francis… (Holy See Press Office)