Holidays & seasons · Updated August 15, 2026
Christmas was not celebrated by early Christians until the 4th century. For the first few centuries of Christianity, believers focused more on the resurrection and Easter than on the nativity. Early Christian writers like Justin Martyr and Irenaeus addressed the nature of Christ and the structure of the early Church but wrote no theological treatises on Christ's birth. The establishment of Christmas as a Christian festival occurred alongside the development of doctrines about Christ's nature at councils such as Nicaea and Chalcedon.
The first recorded Christmas celebration took place on December 25, 336 AD, in Rome. This date aligned with pre-existing pagan festivals such as Saturnalia, which ran from December 17-23, and the celebration of Sol Invictus, the 'Unconquered Sun,' on December 25. These Roman traditions were already times of merrymaking and festivity. Pope Julius I, in 350 AD, officially declared December 25 as the date for celebrating Christ's birth. This decision provided a Christian alternative to popular pagan festivals and aided the spread of Christianity across the Roman Empire. The Council of Nicaea in 325 AD unified Christian practices and beliefs, which set the stage for these later developments.
Several biblical passages form the foundation of the Christmas narrative. In Luke 2:10-11, an angel announces to shepherds, "A Savior has been born to you; he is the Messiah, the Lord." This passage announces Jesus' divine mission.
Theologically, Christmas signifies the incarnation, where God became human in Jesus, bridging the divine and human realms. This doctrine centers on the fulfillment of Old Testament prophecies and the initiation of God's redemptive plan through Jesus' birth. Different Christian traditions interpret Christmas through their theological frameworks. The Council of Chalcedon in 451 AD affirmed the dual nature of Christ, both fully divine and fully human, a concept that underpins the Christmas celebration across Catholic, Protestant, and Orthodox branches. Catholic theologian Thomas Aquinas emphasized the mystery of the incarnation, while Protestant reformers like Martin Luther focused on the accessibility of Christ to all believers. The Eastern Orthodox Church celebrates the nativity as part of its liturgical cycle of Salvation.
Many people today believe Christmas has always been celebrated on December 25, but this date was chosen centuries after Jesus' birth. The modern celebration of Christmas blends religious reverence and cultural customs. The holiday is sometimes caught between its spiritual meaning and commercial aspects. Some Christians emphasize its theological roots, focusing on the story of Christ's birth and its implications for human salvation. Others prioritize family gatherings, gift-giving, and cultural traditions that have become part of the holiday. These differing approaches reflect ongoing debates within Christianity about the role of tradition and modernity.
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