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https://www.christianity.com/wiki/holidays/the-12-days-of-christmas-lyrics-meaning.html
The 12 Days of Christmas Lyrics: Meaning and History

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What Are the 12 Days of Christmas?
The Twelve Days of Christmas, also known as Twelvetide, is a festive Christian season celebrating the Birth of Jesus. In 567, the Council of Tours "proclaimed the twelve days from Christmas to Epiphany as a sacred and festive season, and established the duty of Advent fasting in preparation for the feast." Christopher Hill and William J. Federer state that this was done to solve the "administrative problem for the Roman Empire as it tried to coordinate the solar Julian calendar with the lunar calendars of its provinces in the east."

Why were these 12 days important?
These dozen days were tied to more than just the teaching of the Catholic Church. A host of other denominations also celebrated the 12 days of Christmas. Some denominations celebrated Christmas in January and began to count the 12 days then. But when they began, counting the days became an important facet of each holiday season. Even in the Dark Ages, in some Eastern European churches, the 12 days of Christmas meant attending daily church services. For Christians who lived during this extremely difficult age, the 12 days were a time of rededication and renewal. It was also a period when children were given small, simple, and usually symbolic gifts of faith. Thus, the twelve days were considered a holy period in both coded poems and public worship.

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