How started Halloween?

This is an activity related to the birth of Halloween, it's quite interesting so I hope you like it.

Some thousands of years ago, the Celts were in what is now known as Great Britain and France, and celebrated the new year on November 1, so it began with the issue from October 31 at night. But taking it very seriously, and priests dedicated to Samhain night, the death knight. Great bonfires were lit, horses and sometimes even humans were sacrificed to ward off witches and evil spirits, it turns out that in the Celtic custom the dead returned on the night of Samhain, to seek food at the frightened villagers who cursed and made victims of their spells if they agreed to their requests (or give me or I make a prank, which is the translation of "Trick or Treat").

Reference: http://www.aporrea.org/actualidad/a26690.html