Summorum Pontificum

Summorum Pontificum is the Apostolic Letter motu proprio data of Pope Benedict XVI, which formulates the canonical rules to be respected in the Latin Rite of the Catholic Church for the celebration of Mass according to the "Missal promulgated by John XXIII in 1962", otherwise known as the Tridentine Mass, and the administering of most of the sacraments in the form prior to the liturgical reforms after the Second Vatican Council.