Samhain is an ancient Celtic festival marking the end of the harvest season and the beginning of the dark season of the year. Celebrated around November 1, this celebration originating among the Gaelic peoples symbolized the transition from summer to winter and held a central place in the Celtic ritual calendar. Tradition maintains that at Samhain, the boundary between the human world and the “Otherworld” opened, allowing supernatural forces to surge among the living. This liminal moment of the “end of the year” offered a distinctive atmosphere, conducive to legendary tales and community gatherings. Explanation.
Celtic Origins of Samhain
The term Samhain (spelled Samain in older sources) means “end of summer” in the Gaelic language. It refers both to the festival celebrated around November 1 and to the first month of the winter season in the Celtic calendar. This festival has its origins in Celtic prehistory: it was celebrated by the Gaels of Ireland and present-day Scotland, as well as by the Insular Celts of the Isle of Man, and had equivalents among the Continental Celts. Samhain was one of the four major festivals that structured the Celtic year, alongside Imbolc (February), Beltane (May), and Lughnasa (August). According to specialists, it marked the starting point of the Celtic annual cycle - a genuine symbolic “New Year” marking the transition between the old and new years. In medieval Ireland, texts commonly used the expression tánai na bliana (“the end of the year”) to refer to this Samhain period, demonstrating its importance as a temporal turning point.
The Celtic peoples divided the year into two contrasting seasons: the bright, warm season (spring and summer) and the dark, cold season (autumn and winter). The night preceding November 1, the eve of Samhain, thus marked the close of the fair season and the entry into winter. In the Brittonic Celtic languages, the meaning remained transparent: in Breton, November is called miz du (“black month”), and kala-goañv refers to the calends (beginning) of winter. Similarly, the Welsh celebrated Calan Gaeaf - literally the “calends of winter” - on the same date, and this day was considered the end of the old year in their local traditions.
Although we have no pre-Christian Celtic texts to attest to it directly, archaeological and linguistic sources confirm Samhain’s historical depth. The Coligny calendar, a Gaulish calendar from the 2nd century discovered in Gaul, mentions a month called Samonios, closely linked to Samhain. This calendar even attests to a festival called Trinox Samoni, or “Three Nights of Samonios,” corresponding to the three nights marking the beginning of this winter period and the new annual cycle. Thus, among the Gauls as among the Gaels, the year seems to have begun around the beginning of November, confirming the antiquity of this seasonal milestone. Samhain’s origins can therefore be situated in the shared cultural heritage of the ancient Celts, for whom this autumnal transition was a major agricultural and spiritual landmark.
Rituals and Meanings in Ancient Ireland and the Celtic Lands
In pre-Christian Ireland, Samhain involved collective rituals and celebrations marking the end of the harvest period. Above all, it was a major agricultural and social festival: on this date, all fieldwork was expected to be completed and winter provisions secured. Communities slaughtered some livestock, particularly cattle and pigs, preserving the meat by salting or smoking it to survive the cold season. Herds that had grazed in the uplands during summer were brought back down to the farm enclosures at Samhain. This gathering of livestock was accompanied by abundant feasts at which pork was especially consumed, as it was closely associated with the festival. Texts indicate that the boar held a central place in Samhain banquets: on this occasion, Celtic kings demanded tributes of pigs from their vassals, and the ritual offering of a Samhain piglet (bamb samna in Old Irish) was expected at these communal feasts. The importance of the pig recalls the animal’s sacrificial role and its symbolic connection with the approaching winter in Celtic cosmology.
A notable element of Samhain celebrations was the lighting of ritual fires. Great bonfires (bone fires) were traditionally lit on sacred heights, around which families and clans gathered. In Ireland, Tlachtgha Hill (today Hill of Ward, in County Meath) was renowned for its Samhain fire lit by the druids, whose glow was then used to ignite other bonfires, notably on the nearby Hill of Tara. This network of fires symbolized the unity of the kingdom and the community’s protection for the coming year. Comparable traditions existed throughout the Insular Celtic lands: in Wales, fires were also lit at Nos Calan Gaeaf, and people feared lingering outside once the flames had died down, lest the frightening tailless black sow (yr Hwch Ddu Gwta) appear, roaming about to capture the last person to return home. In general, the night of Samhain was considered especially favorable to supernatural phenomena, and people feared the presence of spirits or malevolent entities wandering through the winter darkness.
Marking the end of one cycle and the beginning of another, this festival was a time “outside time,” a kind of interval in which the veil separating the human world from that of the spirits grew thin. Legends recount that during the night of Samhain, the forces of the Otherworld - gods, fairies (aos sí), and the souls of the dead - could mingle freely with the living. It was therefore customary to take various ritual precautions: offerings of food and drink were left for the spirits in order to win their favor and appease them. In Irish households, it was customary to set a table for deceased ancestors, reserving a place and a meal for these invisible visitors who had returned for one night. At the same time, popular festivities included disguises and masquerades: dressing up as a frightening creature or ghost made it possible to deceive wandering spirits, or at least laugh at their antics. What we now call mumming or guising - going from house to house in disguise in exchange for treats - was already practiced during Samhain vigils and may have been inherited from ancient customs. Finally, Samhain was a privileged time for divination and predictions: various forms of fortune-telling were practiced in an attempt to learn the omens of the coming year, notably by interpreting the shapes of apple peels or observing the behavior of flames and embers in the family hearth. Far from being a purely sinister festival, Samhain thus combined the conviviality of the final autumn festivities with an acute awareness of the mysteries of the unseen and the cycle of life, death, and renewal.
Mythological and Medieval Representations
Medieval mythological tales from Ireland, written from the 9th century onward by monks, preserved many echoes of Samhain’s importance in ancient Celtic culture. These texts often set major events at the time of Samhain, emphasizing the sacred and critical nature of the date. According to the Ulster Cycle, the High King of Ireland convened a great triennial assembly at Tara at Samhain, during a solemn feast bringing together all the kingdom’s nobles and learned men. This Oenach (festive assembly) served to proclaim laws, renew regulations, and validate the country’s annals, showing that Samhain was seen as the appropriate time to reaffirm the social and legal order. That same night, according to legend, the forces of the Sídh nevertheless tested the authority of kings: it is said that on every eve of Samhain, for twenty-three years, the mysterious Aillen mac Midna - a being of the Tuatha Dé Danann - emerged from the fairy hill to blow a magical fire and burn the capital of Tara, until the young hero Fionn Mac Cumhaill finally managed to defeat him. This myth strikingly illustrates Samhain’s duality: a time of political gathering and the strengthening of laws, it was also a time of potential chaos when supernatural powers could overturn the established order.
Other mythical episodes emphasize the motif of Samhain as a turning point between two worlds or two realms. Thus, according to the Book of Invasions (Lebor Gabála Érenn), the Fomorians - monstrous beings associated with darkness and disorder - demanded an annual tribute from the Irish at Samhain, which eventually triggered the great Battle of Mag Tured. The Second Battle of Mag Tured, a legendary confrontation between the civilizing gods (Tuatha Dé Danann) and the oppressive Fomorians, is indeed placed on November 1 in the texts, symbolizing the victory of light over chaotic forces at the threshold of winter. Likewise, an archaic king named Tigernmas is said to have died with hundreds of his subjects while worshiping the idol of the god Cromm Cruach on a Samhain night, which was interpreted as a sign of divine disapproval of ancient bloodthirsty cults. The hero Cúchulainn, a central figure of the Ulster Cycle, was subjected to a curse during a “year of weakness” that began at Samhain and ended exactly one year later, at the following Samhain, subsequently marking the tragic denouement of his life. The recurrence of Samhain in these stories - as the setting for royal deaths, decisive battles, fantastic encounters, or catastrophes - clearly shows that medieval writers perceived this date as exceptional and conducive to upheavals of destiny.
The ancient legal texts and instructional literature (the Irish Brehon Laws) also confirm Samhain’s particular status in social organization. Samhain marked the due date for numerous annual obligations: like the calends among the Romans, it was the date on which rents and leases were settled, agricultural workers received their wages, and employment contracts came to an end to be renegotiated. Seasonal fairs were held at this time, facilitating trade and the renewal of agreements: Ireland is known to have had All Saints’ fairs (derived from Samhain), such as the Snap-Apple Fair of Killmallock, as well as the fairs of Drogheda and Ardagh, and in Scotland the fair at Calton Hill. In Brittany, fairs called kalan-goañv (calends of winter) are mentioned in Carhaix and Ploëzal until the 19th century, possibly preserving a very ancient tradition adapted to a Christian context. Some medieval Irish laws even explicitly regulated Samhain festivities: a legal text known as Dliged Ḟlatha mentions the lord’s right to receive hospitality from his vassals during the Samhain feast and provided for heavy fines if the banquet offered was not adequate. The same text warns of dangers related to behavior during these vigils, indicating that tensions could run high during the festival - unexpectedly lighting a candle during the night of Samhain in the house where a lord was sleeping could be interpreted as an assassination attempt or an act of witchcraft, so charged was the atmosphere with fear and suspicion. These legal testimonies show that Samhain was a festival of social obligation, during which hierarchy and bonds of dependence were ritualized through the banquet, tribute, and hospitality, while remaining a special time when anxiety about the unknown could take hold of people’s minds.
Role in the Celtic Agricultural and Ritual Calendar
Samhain occupied a pivotal place in the agricultural calendar of Celtic societies. As the transition point between the bright and dark seasons, it was a fundamental time marker for rural communities. Until the pre-industrial era, in Ireland as in regions of Celtic culture, November 1 remained an annual milestone for rural life. It marked the definitive end of outdoor work: the last grain and fruit harvests had to be brought in, hay stored, and autumn sowing completed around this date. Peat or firewood reserves for winter were also prepared during the days surrounding Samhain. Thus, the entire agricultural economy was organized around this seasonal shift: anything that had not been completed before Samhain was considered lost for the year that had passed. Conversely, the Samhain period opened the new cycle of winter and preparatory work (repairing tools, planning upcoming crops, ...), hence its character as an “agricultural new year.”
From a ritual perspective, Samhain formed part of the annual cycle as one of the four major turning points of Celtic religion and society. Together with Imbolc, Beltane, and Lughnasa, it formed the four-part framework of the great seasonal festivals, linked to pastoral and agricultural cycles. Of these four festivals, Samhain and Beltane (on May 1, the beginning of the bright season) appear to have been the most crucial, as they divided the year into two contrasting halves. Beltane marked the turning out of livestock to pasture in spring, while Samhain corresponded to the return of livestock to shelter in autumn - these two moments ensuring the survival of the herds and therefore the prosperity of the community. It is not insignificant that both festivals were associated with fire rituals: just as animals were driven between two purifying fires at Beltane, protective bonfires were lit at Samhain to begin the winter under favorable auspices. Some theories even suggest that in Ireland, all household fires had to be extinguished and relit from the sacred fire lit at Samhain by the druids, symbolically renewing the flame of every hearth for the new year - a practice attested for the festival of Saint John but hypothetical for Samhain.
In the Celtic calendar, Samhain also had a prophetic and divinatory dimension linked to the change of cycle. After assessing the yields of the past year at the end of autumn, farmers turned their gaze toward the future at Samhain. Many practices sought to predict the weather for the winter or the coming year: the direction of the wind at midnight on Samhain night was observed, supposedly indicating the prevailing quadrant for the following months. The brightness or obscurity of the moon at Samhain was likewise considered a sign of mild or rainy weather in the weeks that followed. These divinatory practices reflect the anxiety caused by entering the cold season, a period of scarcity and vulnerability, and the ritual desire to ward off uncertainty about the future at this pivotal moment of the year. Samhain, as a calendar milestone, was therefore not merely a religious or social festival: it was a pivot around which agricultural labor, the redistribution of wealth (fairs, tributes), and renewed hope for a prosperous year were organized.
Continuity and Developments after Christianization
With the gradual Christianization of the Celtic lands (from the 5th to the 8th century, depending on the region), the pagan festival of Samhain underwent transformations without entirely disappearing from popular practices. The Church, aware of the deep roots of this autumn celebration, eventually incorporated a major feast on the same date into its liturgical calendar: in 835, Pope Gregory IV officially fixed the feast of All Saints’ Day on November 1 for the Western Christian Church. This choice was probably not coincidental and may have been influenced by Irish or Welsh customs, where November 1 was already an important time of celebration. All Saints’ Day (the feast of all saints) was soon followed, from the 10th century onward, by the commemoration of all the faithful departed on November 2 (All Souls’ Day). This liturgical pairing of November 1 and 2 came to overlay the ancient beliefs of Samhain, partially redefining the meaning of the festival: from then on, the beginning of November was devoted to honoring the saints in Paradise and then the souls of the dead in Purgatory, within a Christian framework of prayer and remembrance.
Despite this Christianization of the calendar, many practices originating with Samhain persisted, tolerated or reinterpreted by the local Church. In Ireland, Scotland, and Brittany, people continued for a long time to light fires on the eve of All Saints’ Day or on the day itself, although these bonfires were sometimes justified on Christian grounds (such as illuminating wandering souls or purifying the air from autumn epidemics). Until the 20th century, it was not unusual to see immense bonfires blaze on the hills during the night of October 31 to November 1. In Dublin, as late as 1970, the police had to intervene to extinguish numerous fires lit by local residents for Halloween. Likewise, the games and divinations practiced on the evening before All Saints’ Day continued late into the tradition: in the 19th century, Irish and Scottish families organized games on Halloween night such as bobbing for apples (catching floating apples in water with the mouth) or examined the shape of egg whites poured into water to predict marriages and future events. These festive-eve customs, clearly inherited from Samhain, were practiced in a now-Christian setting, but their purpose - warding off uncertainty about the future and coming to terms with fears - remained similar to that of the ancient pagan rites.
In Brittany, where the Celtic imprint has long coexisted with fervent Catholicism, a phenomenon of cultural layering can be observed. November 1 and 2 (Kala-Goañv in Breton) formed a unified period of celebration, combining religious reflection with remnants of ancient beliefs. All Souls’ Day (November 2) was marked by solemn practices - funeral vigils, prayers for the drowned, and processions to cemeteries - conveying a serious tone in traditional Brittany. By contrast, the night of October 31 retained a lighter and more playful character: families gathered around the fireplace, told stories, and played indoor games, perpetuating the memory of the Samhain vigils of old. Fear of spirits roaming in the darkness indeed drove people to remain at home that night, with the warmth of the hearth replacing the fires on the hills of earlier times. Thus, even transformed by Christianization, the All Saints’ period in the Celtic lands continued to shelter, beneath the surface, the practices and spirit of Samhain: community, remembrance of the dead, entertainment, and protective rites endured in an attenuated or syncretic form. Until the 19th century in Ireland, the eve of All Saints’ Day was commonly called Oíche Shamhna (“Samhain night”), proof that the ancient festival remained alive in the popular consciousness despite its Christian veneer.
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Modern Interpretations of Samhain
From a symbolic perspective, historians view Samhain as a rite of passage and inversion, comparable to other festivals marking the new year in various cultures. The notion of liminality (a threshold state) is used to characterize Samhain: like the night that belongs neither to the old year nor to the new, Samhain created an in-between space conducive to questioning norms and communicating with the unseen. Stories of the doors of the sídhe (fairy forts) opening and beings invading the earthly world are interpreted seriously by anthropologists as a mythological expression of this temporal liminality. In other words, Samhain was a ritualized outlet in which people could evoke everything normally repressed - death, chaos, and spirits - in a festive and controlled context, enabling them to start afresh the next day.
It should also be noted that Samhain has experienced renewed interest through current neo-pagan movements (such as Wicca and contemporary druidism), which seek to recreate or reinterpret the ancient Celtic festivals. These groups celebrate Samhain every October 31 as one of their eight major festivals.
From Samhain to Halloween: The Link with Anglo-Saxon Cultures
To conclude, it is interesting to trace how Samhain gave rise to modern Halloween in Anglo-Saxon countries. The term Halloween is a contraction of All Hallows’ Eve, meaning “the eve of All Saints’ Day” in English. Originally Christian in name alone, Halloween nevertheless inherited many customs directly derived from Samhain, especially through Irish and Scottish folklore. For centuries, Gaelic communities continued to celebrate the night of October 31 with fires, disguises, and door-to-door quests, thus perpetuating Oíche Shamhna beneath a Christian veneer. In the 19th century, during the great waves of Irish and Scottish emigration to North America, these traditions crossed the Atlantic. Most American Halloween customs - grotesque lanterns, trick-or-treat, and macabre costumes - stem directly from the popular practices of Gaelic immigrants. The famous Halloween lantern, the Jack-o’-lantern, was originally a hollowed-out turnip containing a candle, used to frighten passersby or drive away evil spirits during the night of Samhain. In rural Ireland, these “ghost turnips” were traditionally carved and placed near houses on October 31 to illuminate (or frighten) travelers who lingered. It was only in the United States, where pumpkins were more abundant, that the pumpkin replaced the turnip, giving us the orange emblem known today.
Once established in North America, Halloween evolved through contact with urban culture and consumer society, becoming by the beginning of the 20th century a secular festival popular with children and adults alike. Costume parades, scary games, and the playful theme of fear developed, sometimes becoming disconnected from their Celtic roots. Yet Samhain’s legacy can still be glimpsed beneath the surface: the idea of a night when social roles are reversed (children rule the streets, monsters become familiar), when death is tamed through laughter and disguise, and when the community comes together around festive rituals. Ironically, after flourishing across the Atlantic, Halloween returned to Europe in the final decade of the 20th century, carried by cultural globalization. In Ireland and Great Britain, it had never entirely disappeared and therefore found renewed vigor, while in countries such as France, it was reintroduced as an imported commercial festival. Nevertheless, in Celtic regions, Halloween remains intimately linked to Samhain in the popular consciousness: in Ireland, the term Samhain is still commonly used to refer to the Halloween season, and until the 1800s English-speaking folklorists used the word Samhain to designate the entire body of Gaelic customs associated with the eve of All Saints’ Day.
Halloween can be seen as the modern, secularized, and internationalized version of the ancient Samhain. What began as a festival marking the turning point of the agricultural year in a corner of pre-Christian Europe became, over the centuries and through migration, a global cultural phenomenon. Yet despite the transformations, the deep connections remain visible: whether in the joy of children going door to door for treats (a distant echo of Samhain offerings), the glow of pumpkins lighting the night (an avatar of ancient Celtic fires and lanterns), or the enduring enthusiasm for ghost stories at the end of October, all of this brings us back to Samhain’s legacy. Knowing the history and worship of Samhain thus makes it possible to restore its full meaning to Halloween, revealing beneath the smiling pumpkin mask the old Celtic soul that still burns within it.
Sources:
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Daniel Giraudon - “Samhain, Halloween: The Night of Games and Spirits in Brittany and the Celtic Lands,” ArMen no. 174, 2009.
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John Biggins - “Of Swine and Samain: Aspects of Early Irish Samain Lore and Law,” The Brehon Lawyer blog, October 31, 2021.
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Encyclopædia Britannica, “Samhain” article (last updated September 12, 2025).
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Wikipedia (English) - “Samhain” page (accessed September 2025).
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Wikipedia (French) - “Coligny Calendar” page (accessed September 2025)
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Lowri Jenkins - “Halloween Traditions” (National Museum of Wales blog), October 27, 2020.
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National Museum of Ireland - Ghost Turnip (folklore object record), accessed in 2025.
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Françoise Le Roux & Christian-J. Guyonvarc’h - Celtic Festivals, Ouest-France Université, 1995 (indirect references).
Par Olivier of Aeternum
Passionate about esoteric traditions and the history of the occult from the earliest civilizations to the 18th century, I share some articles on these topics. I am also co-creator of the online esoteric shop Aeternum.
