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Heritage classified

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Origin and history

The Crucuno Quadrilateral, also known as Crucuno Cromlech, is a megalithic monument located in the village of Crucuno, in Plouharnel, Morbihan. Dated from Neolithic, it is often presented as an astronomical observatory, although this interpretation is based on a controversial restoration carried out in 1883 by Félix Gaillard. The latter modified the arrangement of the stones to give them a perfect rectangular shape, oriented according to the cardinal points and solstice, while the earlier surveys suggested a more complex and extensive configuration.

The first known survey of the site, carried out in 1832 by Mr. Vicars, mentions 36 monoliths organized in 7 queues. In 1847, Cayot-Delandre described a group of menhirs arranged in a confused manner, while a plan of 1883, post-restoration, showed 22 stones without a central element. In 1973, two central slabs, revealed by erosion, were reported by A. Thom. These variations highlight the transformations of the site, whose original area was probably four times larger, with about fifty monoliths.

Ranked a historic monument in 1889, the Crucuno quadrilateral illustrates the debates on archaeological interpretations. The astronomical theories advanced since the 19th century are based on a criticized restoration, questioning their scientific validity. Pre-1883 records, such as cadastral surveys, indicate that the site had a trapezoidal or irregular form, far from the current rectangle. This complex history makes it an important example of the challenges of conserving the megalithic heritage.

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