Following the death of the pro-Arian Emperor Valens at the Battle of Adrianople in 378, Christmas was popularized throughout the East as part of the Orthodox Christian rebirth.
To commemorate the birth of Jesus Christ, whom Christians consider to be the Son of God, Christmas is observed.
Christ's Mass is where the word "Christmas" first appeared (or Jesus). The place where Christians remember that Jesus died and subsequently rose again is at a Mass ceremony, also known as Communion or Eucharist. The only service that could start at midnight (and end before sunrise the next day) was the "Christ-Mass" one. Christmas is thus the abbreviated term for Christ-Mass.
All around the world, whether they are Christians or not, people now celebrate Christmas. It's an occasion for gathering with loved ones and friends to celebrate their blessings.
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