This story of how the 12 days of Christmas was written  as it is circulating the internet.
As usual there is no sign of the author. But they did say it was okay to share it with you.

THE SYMBOLISM OF THE 12 DAYS OF CHRISTMAS SONG:


From 1558 until 1829, Roman Catholics in England were
not permitted to practice their faith openly. Someone during
that era wrote this carol as a catechism song for young Catholics.

It has two levels of meaning: the surface meaning
plus a hidden meaning known only to members of their church.
Each element in the carol has a code word for a religious reality
which the children could remember.

-The partridge in a pear tree was Jesus Christ.
-Two turtle doves were the Old and New Testaments.
-Three French hens stood for faith, hope and love
-The four calling birds were the four gospels of Matthew, Mark, Luke & John.
-The five golden rings recalled the Torah or Law,
 the first five books of the Old Testament.
-The six geese a-laying stood for the six days of creation.
-Seven swans a-swimming represented the sevenfold gifts of the Holy Spirit--
Prophesy, Serving, Teaching,  Exhortation, Contribution, Leadership, and Mercy.
-The eight maids a-milking were the eight beatitudes.
-Nine ladies dancing were the nine fruits of the Holy Spirit--
Love, Joy, Peace, Patience, Kindness,
 Goodness, Faithfulness, Gentleness, and Self Control.
-The ten lords a-leaping were the ten commandments.
-The eleven pipers piping stood for the eleven faithful disciples.
-The twelve drummers drumming symbolized
 the twelve points of belief in the Apostles' Creed.