The song "The 12 Days of Christmas" was written by an unknown author. It's believed to have been written in the late 18th century, possibly as a memory aid for a game or as a children's song. The lyrics are based on a series of increasingly extravagant gifts given by a person to their true love, one per day for 12 days leading up to Christmas. The song has since become a popular Christmas carol and a cultural icon, known for its unusual lyrics and repetition of the same refrain.