The Mass of Saint-Sécaire
The Mass of Saint-Sécaire (Occitan: Massa de Sant-Secaire) is a ritual supposed to have been performed in Gascony, France. The best-known account of the Mass is that of James George Frazer in his 1890 omnibus The Golden Bough; Frazer's description, in turn, was taken nearly verbatim from a less well-known French book published in 1883, Quatorze superstitions populaires de la Gascogne ("Fourteen Popular Superstitions of Gascony"), by Jean-François Bladé.
Source: Wikipedia — The Mass of Saint-Sécaire (CC BY-SA 4.0)