The holiday’s roots are found in medieval Catholic piety.
Nothing could be further from the truth. The origins of Halloween are, in fact, very Christian and rather American. Halloween falls on October 31 because of a pope, and its observances are the result of medieval Catholic piety.
It’s true that the ancient Celts of Ireland and Britain celebrated a minor festival on Oct. 31 — as they did on the last day of most other months of the year. However, Halloween falls on the last day of October because the Feast of All Saints or "All Hallows" falls on Nov. 1. The feast in honor of all the saints in heaven used to be celebrated on May 13, but Pope Gregory III (d. 741) moved it to Nov. 1, the dedication day of All Saints Chapel in St. Peter’s at Rome. Later, in the 840s, Pope Gregory IV commanded that All Saints be observed everywhere. And so the holy day spread to Ireland. The day before was the feast’s evening vigil, "All Hallows’ Even" or "Hallowe’en." In those days, Halloween didn’t have any special significance for Christians or for long-dead Celtic pagans.
In 998, St. Odilo, the abbot of the powerful monastery of Cluny in Southern France, added a celebration on Nov. 2. This was a day of prayer for the souls of all the faithful departed. This feast, called All Souls’ Day, spread from France to the rest of Europe.
So now the Church had feasts for all those in heaven and all those in purgatory? What about those in the other place? It seems Irish Catholic peasants wondered about the unfortunate souls in hell. After all, if the souls in hell are left out when we celebrate those in heaven and purgatory, they might be unhappy enough to cause trouble. So it became customary to bang pots and pans on All Hallows’ Even to let the damned know they were not forgotten. Thus, in Ireland, at least, all the dead came to be remembered — even if the clergy were not terribly sympathetic to Halloween and never allowed "All Damned Day" into the Church calendar.
But that still isn’t our celebration of Halloween. Our traditions on this holiday center around dressing up in fanciful costumes, which isn’t Irish at all. Rather, this custom arose in France during the 14th and 15th centuries. Late medieval Europe was hit by repeated outbreaks of the bubonic plague — the "Black Death" — and lost about half her population. It is not surprising that Catholics became more concerned about the afterlife. More Masses were said on All Souls’ Day, and artistic representations were devised to remind everyone of their own mortality.
We know these representations as the "Dance Macabre" or "Dance of Death," which was commonly painted on the walls of cemeteries and shows the devil leading a daisy chain of people — popes, kings, ladies, knights, monks, peasants, lepers, etc. — into the tomb. Sometimes the dance was presented on All Souls’ Day itself as a living tableau with people dressed up in the garb of various states of life. But the French dressed up on All Souls’, not Halloween; and the Irish, who had Halloween, did not dress up. How the two became mingled probably happened first in the British colonies of North America during the 1700s, when Irish and French Catholics began to intermarry. The Irish focus on hell gave the French masquerades an even more macabre twist.
But, as every young ghoul knows, dressing up isn’t the point; the point is getting as many goodies as possible. Where on earth did "trick or treat" come in?
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