Liturgy of the Hours in the context of "Ranking of liturgical days in the Roman Rite"

The Roman Rite (Latin: Rītus Rōmānus) is the most common ritual family for performing the ecclesiastical services of the Latin Church, the largest of the sui iuris particular churches that comprise the Catholic Church. The Roman Rite governs rites such as the Roman Mass and the Liturgy of the Hours as well as the manner in which sacraments and blessings are performed.

The Roman Rite developed in the Latin language in the city of Rome and, while distinct Latin liturgical rites such as the Ambrosian Rite remain, the Roman Rite has gradually been adopted almost everywhere in the Latin Church. In medieval times there were numerous local variants, even if all of them did not amount to distinct rites, yet uniformity increased as a result of the invention of printing and in obedience to the decrees of the Council of Trent of 1545–1563 (see Quo primum). Several Latin liturgical rites which had survived into the 20th century were abandoned after the Second Vatican Council. The Roman Rite is now the most widespread liturgical rite not only in the Catholic Church but in Christianity as a whole.

A breviary (Latin: breviarium) is a liturgical book used in Christianity for praying the canonical hours, usually recited at seven fixed prayer times.

Historically, different breviaries were used in the various parts of Christendom, such as Aberdeen Breviary, Belleville Breviary, Stowe Breviary and Isabella Breviary, although eventually the Roman Breviary became the standard within the Roman Catholic Church (though it was later supplanted with the Liturgy of the Hours); in other Christian denominations such as the Lutheran Churches, different breviaries continue to be used, such as The Brotherhood Prayer Book.

The Roman Breviary (Latin: Breviarium Romanum) is a breviary of the Roman Rite in the Catholic Church. A liturgical book, it contains public or canonical prayers, hymns, the Psalms, readings, and notations for everyday use, especially by bishops, priests, and deacons in the Divine Office (i.e., at the canonical hours, the Christians' daily prayer).

The volume containing the daily hours of Catholic prayer was published as the Breviarium Romanum (Roman Breviary) from its editio princeps in 1568 under Pope Pius V until the reforms of Paul VI (1974), when replaced by the Liturgy of the Hours.

In the practice of Christianity, canonical hours mark the divisions of the day in terms of fixed times of prayer at regular intervals. A book of hours, chiefly a breviary, normally contains a version of, or selection from, such prayers.

In the Roman Rite of the Catholic Church, canonical hours are also called officium, since it refers to the official prayer of the Church, which is known variously as the officium divinum ("divine service", "divine office", or "divine duty"), and the opus Dei ("work of God"). The current official version of the hours in the Roman Rite is called the Liturgy of the Hours (Latin: liturgia horarum) or divine office.

Nola is a town and a municipality in the Metropolitan City of Naples, Campania, southern Italy. It lies on the plain between Mount Vesuvius and the Apennines. It is traditionally credited as the diocese that introduced bells to Christian worship.

In the canon law of the Catholic Church, clerics regular or clerks regular are clerics (mostly priests) who are members of a religious order under a rule of life (regular). Clerics regular differ from canons regular in that they devote themselves more to pastoral care, in place of an obligation to the praying of the Liturgy of the Hours in common, and have fewer observances in their rule of life.

A psalter is a volume containing the Book of Psalms, often with other devotional material bound in as well, such as a liturgical calendar and litany of the Saints. Until the emergence of the book of hours in the Late Middle Ages, psalters were the books most widely owned by wealthy lay persons. They were commonly used for learning to read. Many psalters were richly illuminated, and they include some of the most spectacular surviving examples of medieval book art.

The English term (Old English psaltere, saltere) derives from Church Latin. The source term is Latin: psalterium, which is simply the name of the Book of Psalms (in secular Latin, it is the term for a stringed instrument, from Ancient Greek: ψαλτήριον psalterion).The Book of Psalms contains the bulk of the Divine Office of the Roman Catholic Church. The other books associated with it were the Lectionary, the Antiphonary, and Responsoriale, and the Hymnary.In Late Modern English, psalter has mostly ceased to refer to the Book of Psalms (as the text of a book of the Bible) and mostly refers to the dedicated physical volumes containing this text.