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Origin and history

The Penglaouic Menhir is an iconic megalithic monument located in Loctudy, Finistère. Built during the Neolithic period, this fine-grained granite block today peaks at about 4 meters in height, although it has lost nearly a metre due to the progressive siltation of the estran. At high tide, it is partially submerged, reflecting the changes in the coastal landscape of Breton over several millennia. Ranked a historical monument by order of 7 May 1974, it was originally used as a landmark to indicate the source of a creek, before becoming a communal boundary marker between Loctudy and Pont-l-Abbé.

On the ancient cadastres, especially the Napoleonic one, the menhir was simply referred to as men (stone) or menhir (long stone) in Breton. His current name, Penglaouic, remains mysterious and is subject to several etymological interpretations. Three hypotheses dominate: the black head (in reference to the coal tit or the dark color of the lichen), the lice head (evoking the lichens covering its summit), or Guillaume's head (linked to a possible local resident so named). These variations reflect the linguistic and cultural richness of Brittany, where toponyms often combine history and legend.

Menhir also illustrates the importance of megaliths in the territorial and symbolic organization of neolithic societies. Located about two kilometres from the coast at the time of its erection, it bears witness to the funeral, ritual or territorial practices of its builders. Today, it is one of the remarkable megalithic sites of Finistère, attracting the attention of archaeologists and history enthusiasts. Its classification as historic monuments underscores its heritage value, while protecting it from erosion or human activities.

Historical descriptions, such as that of Commander Devoir in 1912, reveal an initial height of 4.90 metres above the lowest seas, confirming its progressive erosion. This phenomenon, coupled with the natural siltation of the estran, gradually changes its appearance and accessibility. Despite these changes, the Penglaouic Menhir remains a major vestige of Breton megalithism, integrated with coastal landscapes and local stories.

Finally, its precise location, at 128 Penglaouic according to GPS coordinates, makes it a geographical and historical landmark. Available sources, such as the Merimée base or the work of Aubrey Burl, document its importance in the regional megalithic heritage. Its state of conservation and its variable visibility depending on the tides make it a topic of study for coastal heritage specialists.

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