the Old Testament (referred to as Lesson) or from the letters of Saint Paul, Saint John, or Saint Peter (referred to as Epistle). The Lesson (or Epistle) is contained in a book called the Epistolarium, a liturgical book containing the epistles that were to be said or sung by a subdeacon at a solemn High Mass. The Gospels are contained in a book called Evangeliarium, or more recently called as "Book of the Gospels", that were to be said or sung by a deacon at a solemn High Mass. However, the Ambrosian Rite and the Mozarabic Rite has two Readings to be proclaimed, called Prophetia and Epistola. Catholic Mass Lectionary and the Revised Common Lectionary After the Second Vatican Council of 1962–1965, the Holy See, even before producing an actual lectionary (in Latin), promulgated the Ordo Lectionum Missae (Order of the Readings for Mass), giving indications of the revised structure and the references to the passages chosen for inclusion in the new official lectionary of the Roman Rite of Mass. It introduced an arrangement by which the readings on Sundays and on some principal feasts recur in a three-year cycle, with four passages from Scripture (including one from the Psalms) being used in each celebration, while on weekdays only three passages (again including one from the Psalms) are used, with the first reading and the psalm recurring in a two-year cycle, while the Gospel reading recurs after a single year. This revised Mass Lectionary, covering much more of the Bible than the readings in the Tridentine Roman Missal, which recurred after a single year, has been translated into the many languages in which the Roman Rite Mass is now celebrated, incorporating existing or specially prepared translations of the Bible and with readings for national celebrations added either as an appendix or, in some cases, incorporated into the main part of the lectionary. The Roman Catholic Mass Lectionary is the basis for many Protestant lectionaries, most notably the Revised Common Lectionary (RCL) and its derivatives, as organized by the Consultation on Common Texts (CCT) organization located in Nashville, Tennessee. Like the Mass lectionary, they generally organize the readings for worship services on Sundays in a three-year cycle, with four elements on each Sunday, and three elements during daily Mass: First reading () from the Old Testament or, in Eastertide from certain books of the New Testament; Responsorial psalm () (ideally, to