“…a cup of milk was offered to the serpents to drink from…”

"A Pedra da Serpe" (the Serpent's Stone) is situated on the acropolis of the castro of Penalba, which boasts a wonderful panoramic view over the lands of the River Lérez. The rock is oriented towards the sunset and takes the shape of a large serpent, although it can also be interpreted as two serpents mating.

According to tradition, serpents were magical beings and the legend associated with this stone is a demonstration of the ideology of traditional society in symbolic terms: "childless couples who wish to have children must copulate on the stone on the eve of the feast of St. John, taking with them a cup of milk for the serpents to drink from as an offering."