Timeline

Heritage classified

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Origin and history

The Dolmen du Rocher Jacquiaux (or Jacquot) is a remarkable archaeological site located in Saint-Germain-en-Coglès, Ille-et-Vilaine. It consists of two covered aisles 10 metres away, oriented on a west-northwest/east-southeast axis. These partially ruined megalithic structures are about 10 metres long and still retain some original orthostats and covers. Their construction dates back to the Neolithic period, marked by the emergence of monumental stone architecture.

The site was first mentioned by Danjou de la Garenne, who carried out archaeological excavations around the mid-19th century. This research has led to the discovery of pottery and a bronze blade, bearing witness to the ancient human occupation. The dolmen was classified as historical monuments in 1921, recognizing its heritage importance.

According to local legends, demons would come at night to try to reposition the stones displaced by men, without ever achieving it. Another tradition is that the stones were abandoned by demons after they were used to build Mont-Saint-Michel. These folk stories illustrate the symbolic importance of the site in the collective imagination.

The two covered aisles, although partially destroyed, offer an overview of the megalithic architecture of the region. The first aisle initially had 10 orthostats and 9 cover tables, while the second had 18 and 6 tables. Today, a single cover table remains for each aisle, up to 3.50 meters long for the first.

The excavations of Danjou de la Garenne revealed artifacts, including pottery and a bronze blade, which suggest a funeral or ritual use of the site. These discoveries, although limited, contribute to understanding the cultural and religious practices of Neolithic in Brittany.

The Dolmen du Rocher Jacquiaux is a typical example of megalithic monuments in the region, reflecting the technical know-how and beliefs of neolithic societies. Its ranking in 1921 and its preservation allow today to study and value this exceptional heritage.

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