A breviary (from Latin brevis, 'short' or 'concise') is a liturgical book of the Latin liturgical rites of Catholic Church containing the public or canonical prayers, hymns, the Psalms, reaings, and notations for everyday use, especially for priests, in the Divine Office (i.e., at the canonical hours or Liturgy of the Hours, the Christians' daily prayer). The volume containing the daily hours of prayer was published under this name until the reforms of Paul VI, when it became known as the Liturgy of the Hours. However, these terms are used interchangeably to refer to the Office in all its forms. This entry deals with the Breviary prior to the changes introduced by Pope Paul VI in 1974.