The General Roman Calendar is the liturgical calendar that indicates the dates of celebrations of saints and mysteries of the Lord (Jesus Christ) in the Roman Rite of the Catholic Church, wherever this liturgical rite is in use. These celebrations are a fixed annual date, or occur on a particular day of the week. Examples are the Feast of the Baptism of the Lord in January and the Feast of Christ the King in November. Others relate to the date of Easter. Examples are the celebrations of the Sacred Heart of Jesus and the Immaculate Heart of Mary. National and diocesan calendars, including that of the diocese of Rome itself as well as the calendars of religious institutes and even of continents, add other saints and mysteries or transfer the celebration of a particular saint or mystery from the date assigned in the General Calendar to another date. These liturgical calendars indicate the degree or rank of each celebration: memorial (which can be merely optional), feast, or solemnity. Among other differences, the Gloria is said or sung at the Mass of a feast but not at that of a memorial. The Creed is added on solemnities. The last general revision of the General Roman Calendar was in 1969 and was authorized by the motu proprio Mysterii Paschalis of Paul VI. The motu proprio and the decree of promulgation were included in the book Calendarium Romanum, published in the same year by Libreria Editrice Vaticana. This contained the official document Universal Norms on the Liturgical Year and the Calendar, and the list of celebrations of the General Roman Calendar. Both these documents are printed, in their present revised form, in the Roman Missal, after the General Instruction of the Roman Missal. Selection of saints included While canonization involves the addition of the saint's name to the Roman Martyrology, it does not necessarily involve the insertion of the saint's name into the General Roman Calendar, which mentions only a very limited selection of canonized saints. There is a common misconception that certain saints, (e.g., Christopher) were "unsainted" in 1969 or that veneration of them was "suppressed". Christopher is recognized as a saint of the Catholic Church, being listed as a martyr in the Roman Martyrology under 25 July. In 1969, Paul VI issued the motu proprio Mysterii Paschalis. In it, he recognized that, while the written Acts of Saint Christopher are merely