where does the term christmas come from

The term "Christmas" comes from the Old English word "Cristes maesse," which means "Christ's mass." It is a religious holiday that commemorates the birth of Jesus Christ. In the early days of Christianity, Christmas was celebrated on January 6th, the traditional date of Jesus' birth. However, in the fourth century, the Roman Catholic Church moved the date of Christmas to December 25th, which was a date already celebrated by pagans as the winter solstice.