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Heritage classified

Origin and history

The Menhir de Guihallon, nicknamed Grosse Pierre by the inhabitants, is an emblematic megalithic monument located in Lamballe-Armor, in the department of Côtes-d-Armor. Built during the Neolithic period, it stands on the highest point of the commune, in the middle of rocky chaos. Its parallelepipedic shape, its imposing dimensions (5.20 m in height, 3.60 m in maximum width, 10 m in perimeter) and its composition in local gabbro make this a remarkable testimony of the architectural practices of this time.

Ranked as historical monuments by order of 28 December 1965, the menhir is now owned by Lamballe. Its precise location, referenced in the cadastre of Tregomar (park A 291), and its state of conservation make it a site studied to understand the ritual or symbolic uses of megaliths in Brittany. Available sources, such as Wikipedia and Monumentum, highlight its heritage importance, although its detailed history remains partially documented.

Neolithic in Brittany was marked by an agro-pastoral society where megaliths probably played a role in funeral, astronomical or territorial practices. Menhirs, often associated with isolated alignments or sites such as Guihallon, reflect a collective organization capable of mobilizing resources to erect these monumental stones. Their persistence in the Breton landscape testifies to their anchoring in local memory, far beyond their original function.

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