Because Passover was held on the 14th of the month, this feast is referred to as the Quartodecimal.All the major events of Christ's life, especially the passion, were celebrated on this date.
Popular modern customs of the holiday include gift giving, completing an Advent calendar or Advent wreath, Christmas music and caroling, lighting a Christingle, viewing a Nativity play, an exchange of Christmas cards, church services, a special meal, and the display of various Christmas decorations, including Christmas trees, Christmas lights, nativity scenes, garlands, wreaths, mistletoe, and holly.
In addition, several closely related and often interchangeable figures, known as Santa Claus, Father Christmas, Saint Nicholas, and Christkind, are associated with bringing gifts to children during the Christmas season and have their own body of traditions and lore.
According to the Calculation hypothesis, celebration of the quartodecimal continued in some areas and the feast became associated with Incarnation.
The Calculation hypothesis is considered academically to be "a thoroughly viable hypothesis", though not certain.
The first recorded Christmas celebration was in Rome in 336.
Christmas played a role in the Arian controversy of the fourth century.The canonical gospels of Luke and Matthew both describe Jesus as being born in Bethlehem in Judea, to a virgin mother.In the Gospel of Luke account, Joseph and Mary travel from Nazareth to Bethlehem for the census, and Jesus is born there and laid in a manger.Various factors contributed to the selection of December 25 as a date of celebration: it was the date of the winter solstice on the Roman calendar; it was about nine months after March 25, the date of the vernal equinox and a date linked to the conception of Jesus.December 25 was the date of the winter solstice on the Roman calendar.Jesus was considered to be the "Sun of righteousness" prophesied by Malachi: "Unto you shall the sun of righteousness arise, and healing is in his wings." Such solar symbolism could support more than one date of birth.