CIRCA 33 (DEATH OF CHRIST) - 130: Many parts of the present traditional Latin Mass, such as the Introit, Gloria, readings from Scripture and washing of the hands, are found in the earliest forms of the Mass. The prayers from the Canon to the Consecration are the same as in the Tridentine Roman Missal of 1570, but in a different order.
CIRCA 130 - 1500'S: Some changes and additions were made to the Mass. For example, the number of readings from Scripture was fixed at two, and the prayers from the Canon to the Consecration were set in the order still found in the Tridentine Roman Missal.
COUNCIL OF TRENT, 1570: Pope St. Pius V codified the Latin Mass, which became known as the Tridentine Mass. The parts of the Mass already in place for centuries were put in the order still found in the present Roman Missal. The Tridentine Mass of 1570 was declared the universal norm of the Holy Sacrifice of the Mass for the Roman rite.
1951-1962: Some changes were made to the Tridentine Roman Missal; for example, St. Joseph's name was added to the Canon. Pope John XXIII promulgated the Roman Missal of 1962.
1963-1965: Although Vatican Council II approved some changes in the liturgy of the Mass in Sacrosanctum concilium, the Latin language was to be preserved in the Latin rites, with some exceptions for the use of the vernacular.
1969: Pope Paul VI replaced the Tridentine Mass with the new Order of Mass (Novus Ordo Missae). A number of changes from the Tridentine Missal were made in the Novus Ordo, such as permission for the use of the vernacular instead of Latin.
1984: Pope John Paul II promulgated Quattuor Abhinc Annos, which permitted the use of the Roman Missal of 1962 for those groups who were still attached to it, providing that the local bishop had given permission. This became known as the indult Mass.
1988: Pope John Paul II, in Ecclesia Dei, called for a 'wide and generous application' of the 1984 indult for the use of the Roman Missal of 1962 for the universal Church, with the permission of the local bishop.
2007: Pope Benedict XVI, in Summorum Pontificum, declared that the traditional (Tridentine) Latin Mass had never been abrogated. He established the traditional Latin Mass as an 'extraordinary form of the Liturgy of the Church' and extended the use of the Roman Missal of 1962 to all priests. Since permission of the local bishop is not required, this is no longer an indult Mass.