Christmas wasn't widely observed until after Emperor Constantine converted to Christianity and declared it the Roman empire's favored religion. Western Christians officially began celebrating December 25 as the birth of Jesus in 336 AD.
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intohyunjae
Christmas is celebrated to remember the birth of Jesus Christ, who Christians believe is the Son of God. The name 'Christmas' comes from the Mass of Christ (or Jesus).
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Christmas wasn't widely observed until after Emperor Constantine converted to Christianity and declared it the Roman empire's favored religion. Western Christians officially began celebrating December 25 as the birth of Jesus in 336 AD.