Around the year 1052 near this place called "The Dragon Pit" legend reports that at the time of William II Talvas, lord of Domfront and successor to Robert de Bellême, there lived a ferocious dragon who sowed terror in the region. Teutates, an old soothsayer living as a hermit in the Andaines Forest, not far from it, suggested to the lord to bring each day a young victim aged ten to twenty years old, chosen at random from among the population, in order to appease the anger of the dragon.
Only one day, chance fell upon William II Talvas since his daughter, Mabile, was chosen by fate. The unfortunate child therefore had to prepare for the sacrifice. Fortunately, this one had the protection of the heavens.
At the very moment when the procession reached the summit of Tertre Sainte Anne, the appearance of a tall old man on the rock dominating the “Dragon Pit” interrupted the sad ascent. The old man, using prayers, made a large sign of the cross demanding the monster to disappear forever. The dragon, roaring, emerged from the Pit and launched itself into the air. However, his heavy wings could no longer support him, so he fell into the Varenne, where his fall dug a bottomless chasm called "La Fosse-Tertière".