Traditionalist Catholicism

Traditionalist Catholicism is a movement within the Catholic Church that emphasizes pre–Second Vatican Council liturgy, doctrine, and practices, especially the traditional Latin Mass.

Tridentine Mass: The Roman Rite liturgy codified after the Council of Trent and commonly celebrated in Latin before Vatican II. It is the principal liturgical form associated with the movement.
Sacrosanctum Concilium: The Second Vatican Council’s 1963 constitution on the sacred liturgy. Its call for liturgical reform became a key point of interpretation and dispute.
FSSP: The Priestly Fraternity of Saint Peter, a Catholic society of apostolic life founded in 1988 that celebrates the traditional Roman liturgy. It maintains traditional worship while remaining in full communion with Rome.
Summorum Pontificum: Pope Benedict XVI’s 2007 motu proprio liberalizing celebration of the preconciliar Roman Missal. It broadened access to the traditional Mass and framed it as an extraordinary form of the Roman Rite.
Second Vatican Council: The Catholic Church’s ecumenical council held from 1962 to 1965, which addressed liturgy, church life, and relations with the modern world. Its reforms mark the historical boundary central to traditionalist identity.
Novus Ordo: The form of the Roman Rite Mass promulgated by Pope Paul VI in 1969 after Vatican II. Its use distinguishes many postconciliar parishes from traditionalist worship.
Sedevacantism: The position that the papal see is vacant because recent claimants are not legitimate popes. It is a radical position held by some traditionalists, not the movement as a whole.
Traditionis Custodes: Pope Francis’s 2021 motu proprio restricting use of the 1962 Roman Missal. It reversed much of the previous expansion and renewed disputes over liturgical policy.
Roman Rite: The largest Latin liturgical rite of the Catholic Church, encompassing several forms of the Mass and other rites. Traditionalist worship belongs to this broader liturgical tradition.
Pope Paul VI: Pope of the Catholic Church from 1963 to 1978, who promulgated the reformed Roman Missal. His liturgical reforms became a central focus of traditionalist criticism and debate.

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