On the eve of Samhain, when the Irish year tipped over into winter, the people of the old midlands walked to a field in west County Cavan and lay face-down in the dirt. They called the place Magh Slecht, the Plain of Prostrations. At its centre stood Crom Cruach, an idol of gold ringed by twelve lesser stones, and the texts say the worshippers brought him their firstborn children in exchange for milk and grain.
The idol on the Plain of Prostrations
Crom Cruach, the bent one of the mound, was the chief idol of pre-Christian Ireland in the reading of the archaeologist Michael J. O’Kelly. The 12th-century Metrical Dindshenchas describes a central figure of gold, surrounded by twelve subordinate images of stone. Some readers have seen in that a sun encircled by the twelve signs of the zodiac, which would make Crom a solar god as much as a god of the harvest.
What the worshippers wanted from him was plain: milk from the cattle, grain from the ground. What they are said to have given in return was their children. Magh Slecht was crowded ground. Before quarrying and farming thinned it, the plain held more than eighty prehistoric monuments, from megalithic tombs to stone circles, one of the densest concentrations of ritual building anywhere in Ireland.
The night the high king died
The most famous Samhain at Magh Slecht ended in mass death. The high king Tigernmas came to worship with about three-quarters of the men of Ireland, and the chronicles say they died there at the idol while they bowed. The Annals of the Four Masters fix the date at 1413 BCE, and the Irish chronicle tradition counts it as the Seventh Plague of Ireland.
The texts read the catastrophe as the god turning on the people who fed him. Modern writers have reached for other explanations, contaminated grain or a sickness carried by the autumn pilgrimage, but the chronicle offers no medical detail. It says they bowed, and they died. A standing stone is still said to mark Tigernmas’s grave on the plain.
Patrick breaks the idol
In the fifth century a Romano-British missionary named Patrick reached the plain. The scene is not in his own surviving writings, and it is missing from the two earliest Lives of him; J.B. Bury argued a passage had dropped out of one of them. But the 9th-century Tripartite Life tells it in full. Patrick raises the Bachall Isu, the Staff of Jesus, and the gold idol falls face-down toward the Hill of Tara. Its covering crumbles to dust, the staff leaves its mark burned in the stone, and the twelve surrounding idols sink into the earth at the same instant.
The Metrical Dindshenchas puts it more bluntly: Patrick “plied a sledge-hammer on Crom from his head to his foot.” That phrase, head to foot, keeps catching scholars’ eyes, because a plain cone of stone has no head and no foot. Something with a face was broken at Magh Slecht.
What still stands
In 1921 a broken, partly buried stone was dug out of the townland of Killycluggin, on the same plain, beside a Bronze Age stone circle. Reconstructed, it stands over six feet, carved in the curvilinear La Tène style of the late Iron Age, its top bearing the same hair-motif found on other Celtic sculpted heads. Local tradition had always called it the Crom stone. Whether it is literally the idol Patrick broke is archaeologically uncertain, and O’Kelly preferred to tie it to Crom Dubh, the folk successor. Either way it is broken and headless, and the smashing fits the story.
The god outlived his idol. He returns in folklore as Crom Dubh, the Black Crooked One, a harvest-hoarding figure beaten each year so that the grain can be let loose, a struggle the folklorist Máire MacNeill traced across the surviving Lughnasadh customs of Ireland. That contest still draws crowds. The climb up Croagh Patrick on Reek Sunday, by tens of thousands of pilgrims every July, is its living end.
What we can and cannot know
How much of this happened is a question the sources cannot settle. The human sacrifice and the firstborn children reach us only through Christian writers describing the religion they had come to replace, and they had every reason to make the old god monstrous. The certain part is smaller: a carved Iron-Age stone stood on that plain, it was deliberately smashed, and a bent god fed with children was remembered in the same county for fifteen hundred years afterward.
The full profile of the god, his names, his appearance, his long afterlife, and the strange road from a Cavan field to the mountain deity Conan the Barbarian kneels to, is in our bestiary entry: Crom Cruach.
Sources
Bibliography. The same list is held in the article’s frontmatter for the citation tools that read it programmatically.
- Metrical Dindshenchas, ‘Mag Slecht’ poem, Book of Leinster (12th century, from older oral material)
- Tripartite Life of Saint Patrick / Bethu Phatraic (9th century)
- Jocelin of Furness, Life and Acts of St. Patrick (12th century)
- Annals of the Four Masters (17th-century compilation of older annals)
- Killycluggin Stone, Iron Age (second half of the 1st millennium BCE), Cavan County Museum, Ballyjamesduff
- Máire MacNeill, The Festival of Lughnasa (Oxford University Press, 1962)
- Michael J. O’Kelly, Early Ireland: An Introduction to Irish Prehistory (Cambridge University Press, 1989)
