Thousands of years ago, the Celts who lived in the area that is the present day United Kingdom, Ireland and Northern France celebrated the night of October 31st. Their New Year was on November 1st which marked the end of summer and harvest and the beginning of winter. The Celts associated the season with death and believed that on the night before their New Year the boundary between the living and the dead was distorted.
The Celts celebrated the night of October 31 when ghosts of the dead were believed to return to earth causing trouble and damaging the community’s food supply. They observed the event by wearing costumes and lit sacred bonfires to protect them during the coming months. People went “souling” which was begging for “soul cake” and in return the beggars would promise to pray for the dead of the household.
November 1st was later named All Saint’s Day and October 31st was later named All-Hallows Eve and eventually Halloween.