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The word Xmas was first used in the mid-1500s.
The ‘X’ in word Xmas literally means Christ and comes from the Greek letter Χ (Chi). According to a legend, emperor Constantine, on the eve of his great battle against Maxentius, had a vision that led him to create a military banner with the first two letters of Christ on it: ΧΡΙΣΤΟΣ (Christ in Greek) X (Chi) and Ρ (Rho). These two letters, then, became a sort of shorthand for Jesus Christ.