The original legend of La Sayona basically tells the story of a very jealous woman named Casilda, who killed her husband and mother, thinking that they had an affair. His mother, in the agony of death, cursed her. Since then his soul in pain wanders without rest or peace, chasing unfaithful men to conquer them and then kill them. The origin of the name is because it wears a black sackcloth, since the legend dates from the colonial era.

There are thousands of versions of encounters with La Sayona, which are what has popularized this mythical character.1 2 It is also said that La Sayona has the peculiarity of "unfolding", this means that it can be presented as a dog, a wolf or as the woman described above.

But all the versions agree that she is a beautiful woman with long black hair (although she does not maintain this appearance, since once cornered she shows her true form to the victim), who persecutes the womanizing men. This narration is always finished with warnings such as: "Therefore, it is better that those men who enjoy cheating their partner, think it through before La Sayona appears."

The legend also tells that La Sayona always wears white and that her particular cry can be heard in the distance and that it also bristles the hairs of those who hear it. This last feature of La Sayona makes it even closer to the Banshees.