Birth of Our Lord and Savior Jesus Christ of Nazareth in Bethlehem, south of Jerusalem. His arrival would ultimately change the world forever as well as all calendars regarding chronological time differentiating "BC" for "Before Christ" and "AD" for "Anno Domini" - In the year of Our Lord.
Death of Pope Hadrian I, 95th successor of Peter. This Roman-born pontiff had been elected on February 1, 772. During his 13-year papacy he restored the walls of Rome and the ancient aqueducts. The golden statue of the tomb of St. Peter and the silver pavement in front of the altar of the Confession are due to him. He convened the 7th Ecumenical Council in 787 at Nicea in which Iconoclasm was condemned.
Pope Saint Leo III crowns Charlemagne Holy Roman Emperor at St. Peter's on Christmas night.
Pope Clement VI crowns Henry III Holy Roman Emperor. Henry had accompanied this new Saxon Pope to Rome after Popes Sylvester III, Gregory VI and Benedict IX had been deposed.
Saint Francis of Assisi displays the first Nativity creche scene in Greccio, Italy, beginning a lasting and venerable tradition that would remind all of the reason for the season.
Pope Pius VI issues his first encyclical Inscrutabile which outlined the problems of the pontificate.
Pope Pius XII releases his 32nd encyclical Musicae sacrae on sacred music and the use of popular music in the liturgy.