The word for Christmas in late Old English is Cristes Maesse, the Mass of Christ. Christmas is an annual commemoration of the birth of Jesus Christ.
The precise year of Jesus’ birth, which some historians place between 7 and 2 BC, is unknown. His birth is mentioned in two of the four Gospels.
By the early-to-mid 4th century, the Western Church had placed Christmas on December 25, a date later adopted in the East. The date of Christmas was chosen to correspond with the day exactly nine months after Jesus was conceived. (9:4)