Alleged Christianizing of the Celtic Samhain
Ireland never dominated the Catholic Church. It was never the center of that Church. It never held more than a small minority of all adherents to Catholicism at any time in its history. Therefore, any and all claims that the entire Roman Catholic Church refitted its calendar and created a major feast exclusively around the practices of Ireland should be evaluated in this light.
When Christianity eventually reached Ireland in 432 (and later the Anglo-Saxon kingdoms in England), conversion began among the local people, including possible Christianization of old Celtic traditions. However, this could not include co-optation of "samhain" (in November) as All Saints. In Ireland, the All Saints celebration took place on the 20th of April, not in November, according to earliest Irish sources, like the Martyrology of Tallacht and the Felire of Oengus. Such spring celebration was typical of Eastern and Mediterranean Christianity and was tied into the Pentecost season in that part of the world. There was no attempt on the part of missionaries in Ireland to "Christianize" a "Samhain" festival, and no documentation of any such claims has ever been discovered.
Pope Gregory III (731-741) consecrated a chapel in the Basilica of St. Peter to all the saints and fixed the anniversary for 1 November, in accordance with German practices, not Irish. In 835, Pope Gregory IV extended the celebration for all the martyrs (later all saints) on November 1 to include all the churches. The Christian establishment allegedly co-opted the Samhain season (or so it is claimed, although this presumes a truly absurd amount of power and influence on the part of Ireland over the entirety of the Church at this time). Allegedly, when November 1 became the new date for the feast of All Saints, all the Saints and Martyrs being called upon to sanctify the season, the pagan Celtic Samhain became merely 'Hallows Eve'. This claim ignores that the Irish celebration of All Saints was in the spring, as can be verified by consulting the Martyrology of Tallacht and the Felire of Oengus, two original sources from before the time of Pope Gregory's proclamation, while the November celebration was a custom of German Christians. It turned into a vigil of preparation for the morrow, which was made a day of obligation, when Christians were obliged to attend mass.
In the 11th century, the church would make November 2 All Souls' Day, a day to honor all the dead: all the Christian souls in the half-world of Purgatory. Catholic doctrine most clearly reveals the liminal or threshold connection between the two worlds: "that the souls which, on departing from the body, are not perfectly cleansed from venial sins, or have not fully atoned for past transgressions, are debarred from the Beatific Vision, and that the faithful on earth can help them by prayers, almsdeeds and especially by the sacrifice of the Mass." (Catholic Encyclopedia, 1910: 'All Soul's Day').
All Soul's Day was invented or adopted and "Christianized" by Odilo (died 1048) in the Cluniac monasteries, and its observance spread through the so-called "Celtic" north (actually France, England, and Germany) before it was introduced into Italy. The claim of "Christianization", of course, requires that one suspend disbelief and accept that the ancient Irish religion somehow managed to survive intact and very strong into the 11th century, not only survive but expand and spread so that it held great enough sway in High Medieval France (where the Cluniac monastaries were headquartered) to be necessary to "co-opt" yet another early November holiday.
In the 19th century, James Frazer and John Rhys claimed that the Christian establishment had successfully "co-opted" (not their word) the Samhain season, although neither of them presented any direct evidence, whatsoever, of any such "Samhain" festival, beyond the existence of a month in the old Irish calendar with that name. In short, they made it up out of whole cloth. The truth of the matter is that in the very lands where Samhain might have been celebrated, there was no "co-optation" until it coincidentally occurred due to a regularization of a feast that had been celebrated at several different dates--including the month of April, not November, in Ireland.
Halloween customs pre 1900
Observance of Halloween faded in the South of England from the 17th century onwards, being replaced by the commemoration of the Gunpowder Plot on November 5. However it remained popular in Scotland and the North of England. It is only in the last decade that it has become popular in the South of England again, although in an entirely Americanised version.
The custom survives most accurately in Ireland, where the last Monday of October is a public holiday. All schools close for the following week for mid-term, commonly called the Halloween Break. As a result Ireland is the only country where children never have school on Halloween and are therefore free to celebrate it in the ancient and time-honoured fashion.
The custom of trick-or-treating is thought to have evolved from the European custom called souling, similar to the wassailing customs associated with Yuletide. On November 2, All Souls Day, Christians would walk from village to village begging for "soul cakes" - square pieces of bread with currants. Beggars would promise to say prayers on behalf of dead relatives helping the soul's passage to heaven. The distribution of soul cakes was encouraged by the church as a way to replace the ancient practice of leaving food and wine for roaming spirits at the Samhain. See Puck (mythology).
In Celtic parts of western Brittany. Samhain is still heralded by the baking of kornigou. Kornigou are cakes baked in the shape of antlers to commemorate the god of winter shedding his "cuckold" horns as he returns to his kingdom in the Otherworld.
Christianizing the Lemuria
May 13 was the culmination of the Roman Feast of the Lemures, in which the restless wandering spirits of the dead were propitiated with offerings and incantations. Pope Boniface IV at the Feast of the Lemures, 13 May, either in 609 or 610 (the day being considered more significant than the year), reconsecrated the Pantheon in Rome to the Blessed Virgin and all the martyrs, ordering an anniversary. The feast was to honor all the saints, 'known or unknown' and is taken as an early version of All Saints.
However, this still cannot explain away the celebration of the festival of All Saints as a mere "Christianization" of a pagan festival, since the holiday was celebrated in the spring previous to this date by Eastern Christians who were not subject to the Pope and who did not celebrate Latin festivals.
Religious Viewpoints
The mingling of Christian and "pagan" traditions in the early centuries following the founding of the Christian Church have left many modern Christians uncertain of their responsibility towards this holiday. Some fundamentalist Christian groups consider Halloween a Pagan holiday and may refer to it as "The most evil day of the year", refusing to allow their children to participate. Among these groups it is believed to have developed Satanic influences, as have many other Pagan practices. It used to be that on Halloween, schools would give children boxes to collect pennies in for UNICEF, but after these fundamentalist Christians complained that the schools were endorsing a Pagan religion, most schools stopped distributing such boxes. Other Christians, however, continue to connect this holiday with All Saints Day. Some modern Christian churches commonly offer a "fall festival" or harvest-themed alternative to Halloween celebrations. Still other Christians hold the view that the holiday is "safe"; that is, that it is not Satanic in origin or practice and that it holds no threat to the spiritual lives of children.
On this day, Neopagans celebrate the sabbat of
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