The Latin rites were for many centuries no less numerous than the liturgical rites of the Eastern autonomous particular Churches. Their number is now much reduced. In the aftermath of the Council of Trent, in 1568 and 1570 Pope Pius V suppressed the Breviaries and Missals that could not be shown to have an antiquity of at least two centuries (see Tridentine Mass and Roman Missal). Many local rites that remained legitimate even after this decree were abandoned voluntarily, especially in the 19th century. In the second half of the 20th century, most of the religious orders that had a distinct liturgical rite chose to adopt in its place the Roman Rite as revised in accordance with the decrees of the Second Vatican Council (see Mass of Paul VI). A few such liturgical rites persist today for the celebration of Mass, since 1965-1970 in revised forms, but the distinct liturgical rites for celebrating the other sacraments have been almost completely abandoned.
The Roman Rite is by far the most widely used. Like other liturgical rites, it developed over time, with newer forms replacing the older. It underwent many changes in the first millennium and a half of its existence (see Pre-Tridentine Mass). The forms that Pope Pius V, as requested by the Council of Trent, established in the 1560s and 1570s underwent repeated minor variations in the centuries immediately following. Each new typical edition (the edition to which other printings are to conform) of the Roman Missal (see Tridentine Mass) and of the other liturgical books superseded the previous one.
The 20th century saw more profound changes. Pope Pius X radically rearranged the Psalter of the Breviary and altered the rubrics of the Mass. Later Popes continued to make such changes, beginning with Pope Pius XII, who significantly revised the Holy Week ceremonies and certain other aspects of the Roman Missal in 1955.
The Second Vatican Council (1962–1965) was followed by a general revision of the rites of all the Roman Rite sacraments, including the Eucharist. As before, each new typical edition of an official liturgical book supersedes the previous one. Thus, the 1970 Roman Missal, which superseded the 1962 edition, was superseded by the edition of 1975. The 2002 edition in turn supersedes the 1975 edition both in Latin and, as official translations into each language appear, also in the vernacular languages. Under the terms of Summorum Pontificum by Pope Benedict XVI, the Mass of Paul VI is known as the Ordinary Form of the Roman Rite.