It is said that Jesus was conceived by the Holy Spirit and was born by Mary the virgin. In a dream, God sent Gabriel, an emissary, to tell Joseph not to let Mary go because she was unmarried and pregnant, but to marry her and name the child Jesus, which means to save the people from their sins. When Mary was about to give birth, the Roman government issued an order that all the people must declare their household registration in Bethlehem. And Joseph and Mary obeyed. When they arrived in Bethlehem, it was already dark, but they couldn't find a hotel to stay. There was only a stable for them to stay. Just then, Jesus was about to be born. So Mary only gave birth to Jesus in the manger. In order to commemorate the birth of Jesus, posterity set December 25 as Christmas day, and looked forward to mass every year to commemorate the birth of Jesus. At the beginning of the 4th century, January 6 was a double festival in the eastern part of the Roman Empire to commemorate the birth and baptism of Jesus. It was called epiphany, also known as "the day of manifestation". It showed itself to the world through Jesus. At that time, the exception was the Church of lulalem, which only commemorated the birth of Jesus but not the baptism of Jesus. Later historians found in the calendar used by Roman Christians that on December 25, 354 A.D., the page recorded: "Christ was born in Bethlehem, Judah. "Through research, it is generally believed that the Roman church with Christmas on December 25 may start in 336 A.D., spread to Antioch, Asia Minor, about 375 A.D., and to Alexandria, Egypt, in 430 A.D., the church in Jerusalem received late, while the church in Armenia still insists that the Epiphany on January 6 is the birthday of Jesus.

December 25 Japan is the birthday of Mithra, the Persian Sun God, which is a pagan festival. At the same time, the sun god is one of the Roman gods. This day is also the winter solstice in the Roman calendar. The pagans who worship the sun god regard this day as the hope of spring and the beginning of the recovery of all things. For this reason, the Roman church chose this day as Christmas. This is one of the measures that the Church tried to Christianize the customs of the infidels in the early days. Later, although most churches accepted December 25 as Christmas day, they also insisted that the calendars used by churches in different places were different, and the specific dates could not be unified. Therefore, from December 24 to January 6 of the second year, the churches in different places could celebrate Christmas in this period according to the local conditions. Since December 25 was recognized as Christmas by most churches, the original Epiphany on January 6 only commemorates the baptism of Jesus. However, the Catholic Church also designated January 6 as the "Three Kings coming to the court" to commemorate the story of the three eastern Kings (i.e. three doctors) coming to worship when Jesus was born. With the wide spread of Christianity, Christmas has become an important festival for Christians and even non Christians.

In the fourth century A.D., Nicholas was born in the city of badala, Asia Minor. His family was rich. His parents were very enthusiastic Catholic friends. Unfortunately, his parents died early. When Nicholas grew up, he donated all his wealth to the poor. He became a monk, devoted himself to the church, and served the society all his life. Nicholas later became a priest and was promoted to bishop. In his life, he has done a lot of charity work. He likes to help the poor in secret. Santa Claus is his later nickname. The name comes from the story that he secretly sent money to help three girls. After his death, Nicholas was revered as a saint. He was a white bearded old man in a red robe and a red hat. Every Christmas he comes from the north in a deer drawn sleigh, from the chimneys to the homes, putting Christmas presents in socks and hanging them on the children's bedside or in front of the stove.