On that Christmas Eve, a song was born that would reach the hearts of thousands of people throughout the world.
It’s been translated into at least 44 languages and sung by untold millions every December from small chapels to great cathedrals.
During World War I, the carol was sung simultaneously in English and German by troops during the Christmas truce of 1914, as it was one of the few carols that soldiers on both sides of the front line knew.
The song has been recorded by over 300 artists, particularly successful in hit versions by Enya (sung in Irish), Andrea Bocelli or Bing Crosby.
Come on now, it's very easy!