Christmas Day is marked by Christians as a commemoration of the birth of the spiritual teacher whose teachings are the cornerstone of their faith, Jesus of Nazareth.
By bringing Christianity to the areas ruled by the Anglo-Saxons in the sixth century (other Celtic parts of British were already Christian, but there aren't many records about if or how), St. Augustine of Canterbury is thought to have initiated the widespread commemoration of Christmas in significant portions of England.
Although most Christians mark December 25 as Jesus Christ's birthday, few people throughout the first two centuries of the Christian era had any knowledge of the precise day or year of his birth.
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