By the end of the 12th century, the celebration had become known as the holy days of obligation in Western Christianity and involved such traditions as ringing church bells for souls in purgatory. It was also “customary for criers dressed in black to parade the streets, ringing a bell of mournful sound and calling on all good Christians to remember the poor souls”. The Allhallowtide custom of baking and sharing soul cakes for all christened souls, has been suggested as the origin of trick-or-treating. The custom dates back at least as far as the 15th century and was found in parts of England, Wales, Flanders, Bavaria and Austria. Groups of poor people, often children, would go door-to-door during Allhallowtide, collecting soul cakes, in exchange for praying for the dead, especially the souls of the givers’ friends and relatives. This was called “souling”.