The pope’s apostolic letter, promulgated July 16, 2021, contains a set of norms for the celebration of what is popularly known as the “traditional Latin Mass” or “Tridentine Mass” — drawn from the 1962 Roman Missal.
Cardinal Gregory issues norms to implement pope’s ‘Traditionis Custodes’
Pope Francis and Vatican II: It’s not a battleground, but the future
The pope is asking Catholics worldwide to prepare for the next jubilee year by studying the council documents, especially its four constitutions, which focused on: the liturgy; the Church as the people of God; Scripture; and the role of the Church in the modern world.