During the winter, the burning of logs was a common practice among many cultures across Northern Europe. In Scandinavia, this was known as the yule log and originally had a pagan significance; after the Christianization of Scandinavia, it may have been incorporated into the Christian celebration of Christmas there, with the pagan significance no longer remaining. However, as there are no existing references to a Christmas log prior to the 16th century, the burning of the Christmas block may have been an early modern invention by Christians unrelated to the pagan practice.