The Christmas story is a traditional tale that has been passed down through generations, and the exact origin of the story is not known. However, there are several theories about who may have written the Christmas story. One theory is that the story was written by the biblical figure Matthew, who was one of the original twelve disciples of Jesus Christ and the author of the first gospel in the New Testament. Another theory is that the story was written by Saint Jerome, a Christian priest and theologian who lived in the 4th century AD.