The Two Halves of the Irish Year

Worth knowing: the old Irish year was divided into two halves, not four seasons, hinged on Bealtaine in May and Samhain in November rather than on the solstices; the two eves are mirror images of each other, sharing the same prohibitions and the same protective fire; at both, the boundary with the Otherworld was held to thin and the síd to open; the difference between them is one of direction, the bright half turning outward and the dark half inward; and this entry concerns that structure, leaving each festival’s customs to its own page.

Two hinges, not four seasons

The oldest Irish reckoning split the year in two. The bright half ran from Bealtaine, 1 May, to Samhain, 1 November; the dark half ran from Samhain back to Bealtaine. The division is stated outright in the medieval tale the Wooing of Emer, in Kuno Meyer’s translation, which names Bealtaine and Samhain as the year’s two great bounds: summer from the one to the other, winter from the other to the one. This is the structural skeleton beneath the whole body of seasonal custom, and it is older and more basic than any single festival’s observance.

The two further fire festivals, Imbolc at the start of February and Lughnasa at the start of August, fall at the midpoints of the two halves and quarter the year more finely. But the primary axis is the single one of May and November. Notably, it does not fall on the solstices. The midwinter alignment of the great passage tomb at Brú na Bóinne is real, and the solar turning-points mattered, yet the calendar of saga and of folk practice hinges elsewhere, on the two facing eves.

The thin veil at both thresholds

What gives the two hinges their charge is that each was a threshold in more than the calendar sense. On Oíche Bealtaine and Oíche Shamhna alike, the boundary between the human world and the Otherworld was held to weaken, so that the síd, the fairy mounds, stood open and their people moved abroad across the land. Ordinary prohibitions and safeguards were suspended or reversed, and a household’s luck was reckoned most exposed precisely then.

The medieval texts attach this liminality most vividly to Samhain. The Sick Bed of Cú Chulainn, an Old Irish tale, opens at the Ulster Samhain assembly, during which two women of the Otherworld draw the hero into a supernatural sickness. The Adventures of Nera, also Old Irish and edited by Kuno Meyer, sets its whole action on Samhain night at Cruachan in Connacht, where the cave of Oweynagat opens and Nera follows the Otherworld host inside. The cave at Rathcroghan is a real place, still visible, and was the chief Otherworld door of Connacht in the medieval imagination. The same texts also like to claim they explain how Samhain itself began, a literary convention rather than historical record, and it is treated here as such.

Mirror images: what the two eves share

The reason the tradition keeps pairing Bealtaine and Samhain is that they behave as mirror images of one another. Both eves carry the same set of household prohibitions: no fire, coal, salt, milk or eggs to be given out of the house, because to part with them was to part with the household’s luck at the moment it was most fragile. Both place fire at the centre as protection and purification.

The fire rite reaches back to the earliest prose evidence. Cormac’s Glossary, attributed to the scholar-king Cormac mac Cuilennáin and edited by Whitley Stokes with John O’Donovan, glosses the name Bealtaine as a lucky fire, and records the druids making two fires and driving the cattle between them against the year’s diseases. Geoffrey Keating’s seventeenth-century history of Ireland places the great assemblies at the symbolic centres: the Bealtaine fire at Uisnech in the midlands, the Samhain fire at Tlachtga, from which, he writes, all the fires of Ireland were to be kindled. Keating wrote as a Counter-Reformation priest and his account of druidic sacrifice carries the polemic of his age; the fire-assembly tradition itself is independently supported by the glossary and by excavation evidence of intense burning at Tlachtga.

What divides them: direction

If the two hinges share their prohibitions and their fire, what sets them apart is direction. Bealtaine opens the summer half and turns the world outward: the cattle are driven out to pasture, often between or around the protective fires, and the household’s energies move into the open. Samhain closes the summer half and turns the world inward: the cattle come home to the byre, and the Otherworld opens more fully than at any other time, returning not only the sí but the dead, who were given a place at the hearth.

So the bright half belongs to growth and the outer field, the dark half to shelter and the inner hearth. The sí are abroad at both junctures; but at Samhain the dead walk as well, and the púca, the shapeshifting trickster, holds a particular seasonal dominion. The two nights together form a single annual arc, one structure with two facing doors, and the whole body of seasonal custom flows from the lived experience of those two divisions and the danger and opportunity of each crossing.