The information board at the menhir related some of the folklore that surrounds the stone.
As well as the tale of the warring brothers, it is said that the Devil, from the high ground of nearby Mount Dol, saw Saint Samson building the cathedral at Dol. Enraged by this he launched a huge stone at the edifice, which knocked off the top of the north tower, which landing nearby became the Dolmen of Champ Dolent.
Also it is said that the stone imperceptably sinks, whenever someone dies, or in an alternate tale the moon nibbles a bit off the top of the stone each time it is full, causing it to shrink. In both tales when the stone is finally diminished to nothing it will signify the end of days.