Below is a (non-exhaustive) list of official statements from the Magisterium and episcopal decrees on various aspects of the traditionalist movement, including the developments around the 1962 missal, the SSPX, and more.
Magisterial Decrees/Statements
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Quattuor Abhinc Annos: Indult for the Use of the Roman Missal of 1962 (Pope John Paul II, Oct. 3, 1984)
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Ecclesia Dei: Apostolic Letter on the SSPX consecrations (Pope John Paul II, July 2, 1988)
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The Excommunication of the Followers of Archbishop Lefebvre (Pontifical Council for the Interpretation of Legislative Texts, Aug. 24, 1996)
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Summorum Pontificum: On the Use of the Roman Liturgy Prior to the Reform of 1970 (Pope Benedict XVI, July 7, 2007)
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Decree Remitting the Excommunication "Latae Sententiae" of the Bishops of the Society Of St Pius X (Pope Benedict XVI, Jan 21, 2009)
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Accompanying letter to the remission of the excommunications (March 10, 2009)​
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Letter of Pope Francis granting faculties to the SSPX for confessions (Sep 1, 2015)
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Apostolic Letter Misericordia et Misera extending faculties to the SSPX for confessions beyond the Jubilee Year of 2015 (Pope Francis, Nov 20, 2016)
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Letter of the Pontifical Commission “Ecclesia Dei” to the Ordinaries of the Episcopal Conferences concerned on the faculties for the celebration of marriages of the faithful of the Society of Saint Pius X (Pope Francis, March 27, 2017)
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Traditionis Custodes, On the Use of the Roman Liturgy Prior to the Reform of 1970 (Pope Francis, July 16, 2021)
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Letter from Pope Leo XIV to Fr Davide Pagliarani, Superior General of the SSPX
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Decree from the Dicastery for the Doctrine of the Faith on the SSPX consecrations of July 1, 2026