Menhir d’Er Grah: A Neolithic Megalith at Locmariaquer
Site at a Glance
- Rating
- 4.3
- Popularity
- Medium
- Country
- France
- Primary era
- Stone Age
- External website
- Open
- Eras represented
- Stone Age
- Civilizations
- Unclassified
- Site type
- Civic
- Remains
- Monument
On this page8 sections
History
The Menhir d’Er Grah is a Neolithic standing-stone monument at Locmariaquer in France, erected by prehistoric communities around the middle of the fifth millennium BC. Usually dated to about 4700 BC, it formed part of the Locmariaquer megalithic complex with the Er Grah tumulus and the Table des Marchands. With an estimated weight of 300 to 330 tonnes, it is the largest known transported and erected Neolithic stone block in Europe.
Construction and the Neolithic alignment
The menhir originally stood within an alignment of 18 smaller stelae extending northeast for about 55 metres. Excavations in 1988 identified their foundation pits and showed that the stones were apparently arranged from largest to smallest. The sequence also used different rocks, beginning with orthogneiss for the Grand Menhir, followed by migmatite and then locally available Carnac granite. Ceramic and stone objects from the packing pits have been attributed to the Castellic culture, a Neolithic tradition identified through regional pottery and stone remains in western France.
The menhir fell during prehistory and broke into four fragments. Sediments from nearby foundation pits place its construction broadly between 4600 and 4300 BC, while the fall and breakage probably occurred around 4000 to 4300 BC. The precise date and cause remain uncertain. Deliberate toppling, lightning, an earthquake or tremor, and actions during either the Neolithic or the Roman period have all been proposed.
Several of the smaller stones were later removed and reused in nearby tombs and dolmens. The large menhir itself was not reused after it fell, although a relief-bearing slab at the Table des Marchands came from it and was incorporated into that Neolithic chamber tomb. This reuse connects the surviving decoration of the dolmen with the earlier standing monument.
Later observations and changing interpretations
The earliest known image of the monument was prepared by President Robien between 1753 and 1755. It showed the four pieces already lying beside the Table des Marchands and the Er Grah tumulus. The menhir was not shown on the 1830 cadastral map.
In 1837, Prosper Mérimée, a French writer and inspector of historic monuments, observed that the stone had been set only about 3 to 4 feet into the ground. He noted that its base faced away from the other three fragments. Local inhabitants told him that they had never seen it standing, and he considered an eighteenth-century lightning strike a possible explanation for its destruction.
Archaeologists began using the name “Grand Broken Menhir of Er Grah” only in the late nineteenth century. The local Breton name Men ar hroëc’h means “Stone of the fairy,” or more precisely “Stone of the old woman.” A local custom was associated with the fallen fragments on the night of 1 May, when young women slid over them. Since sliding would not have been possible while the menhir stood upright, possibly until the seventeenth century, the custom may have developed from nocturnal rubbing against the standing stone.
Protection and archaeological investigation
The menhir was classified as a French historic monument in 1889. Ideas for restoring or re-erecting it were considered during the nineteenth and early twentieth centuries. Around 1853 and 1854, Paul Reveillère proposed moving it to Paris and erecting it in the Place de la Concorde for the 1900 Exposition Universelle as a symbol of Celtic unity. Around 1904, the archaeologist Zacharie Le Rouzic proposed raising the stone, but the plan was abandoned because re-erection was judged likely to reduce its archaeological value.
Excavation of the Locmariaquer complex began again in 1987. Charles-Tanguy Le Roux directed work on the Grand Menhir and the Er Grah tumulus, while Jean L’Helgouac’h directed investigations at the Table des Marchands. The menhir forms part of the Megaliths of Carnac and the Shores of Morbihan World Heritage designation, inscribed in 2025.
Remains
The monument now lies in four fragments on the ground. Together they form a naturally elongated, spindle-shaped block about 21 metres long. The stone is made of orthogneiss, a metamorphic rock formed from an original igneous rock. Its nearest known outcrops are near Vannes and on the Rhuys peninsula, about 8 to 10 kilometres away by the shortest route, across maritime areas affected by strong currents. A raft may have been needed to cross the estuaries of the Vannes and Auray rivers, although the method of transport is not known.
The fallen stone
The block was extracted from a rocky outcrop and was naturally elongated before it was worked. Two concave depressions on its surface indicate that it had previously lain horizontally exposed, allowing natural erosion to shape it before extraction. Its entire surface was hammered with quartz tools or hammerstones, producing relatively regular and even faces. The lower edge was made perfectly straight.
No intentional cutting or breaking has been identified on the fragments. Their four-part division is attributed to the fall. The upper surface carries relief carving that erosion has largely flattened. One motif represents a crook or staff. A second has traditionally been called a “hatchet-plough,” while Serge Cassen has interpreted it more recently as a cetacean, specifically a sperm whale. The contrasting marine and terrestrial imagery has been understood as reflecting a period of transition, when hunter-gatherer communities were abandoning their earlier way of life.
Foundation and associated alignment
The foundation pit, or prepared socket for the standing stone, has been located. Although part of it was damaged during the Gallo-Roman period, its surviving section shows that the sides were strengthened by small walls made from stacked blocks. Similar blocks covered the bottom and received the wedge-shaped lower end of the menhir.
A mixture of small granite blocks and marine sediments secured the base. The stone entered the packing pit to a maximum depth of about 1.50 metres, so its stability depended chiefly on its own weight. The 18 associated foundation pits included some broken stone bases. After excavation, the discontinuous alignment was marked with stone paving.
Reused relief at the Table des Marchands
A slab incorporated into the Table des Marchands bears decoration corresponding to the relief on the Menhir d’Er Grah. The slab was reused from the fallen monument in the dolmen, a Neolithic chamber tomb. It preserves a physical connection between the broken menhir and another major structure within the Locmariaquer complex.
