Built by Yves Le Denmat between 1703 and 1714, it replaces an older building, of which only the crypt remains. The crypt is in fact an ancient dolmen with a corridor, dating from the Neolithic period and serving as the floor of the south transept of the Chapelle des Sept-Saints. The six stones are divided into two granite tables supported by four vertical slabs. This dolmen is nothing more than the skeleton of an ancient tumulus, i.e. a grave covered in earth.
This configuration bears witness to the first evangelisations in the Celtic world. This chapel is the only witness in France to the cult of the seven sleeping saints of Ephesus, celebrated by Christians and Muslims. The water from its fountain, visible 250 m away, gushes out through seven holes cut in the stone, just like the one at Sétif in Algeria.
Since 1954, an Islamic-Christian pilgrimage has been grafted onto the traditional pardon, thanks to the work of Louis Massignon, an eminent Orientalist and professor at the Collège de France. The festival, which takes place on the fourth Sunday in July, alternates songs from the Breton Gwerz with readings from the Koran, referring to the seven saints. More festive events round off the festivities.
Both the chapel and the dolmen are listed historic monuments.
An information board is available on site in 4 languages.
Guided tours are available on request, but you must register in advance at the Tourist Office, with a minimum of 4-5 participants.