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  The first Christmas Hymn ever was in 336 AD in France and was composed in Latin by St. Hilary of Poitiers
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  they were first known as communal songs during celebrations like harvest tides but also Christmas
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  In England, carols were banned on December 1653 by Oliver Cromwell
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  Wassailing was associated with Christmas and New Years and goes way far back
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  The well known carols were not sung in church until the 19th century. St Francis of Assisi introduced Christmas carols in church