A mysterious old man who lives on an island in the middle of the Ourthe River, an hour north of the manor of Esneux. His hut shelters under the boughs of a mighty oak tree, and an ancient dolmen stands nearby.

The local villagers accuse him of sorcery and being in league with the devil, but many surreptitiously visit him to have their fortunes told by his astronomical divinations. Those who sleep in the shadow of the dolmen sometimes experience strange or prophetic dreams.