The massacre occurred 500 years ago. In 1525, the Spanish Royal Council ordered the execution of five members of a cult recently discovered in the Pyrenees. This event marked the beginning of a relentless, century-long prosecution against Basque witchcraft, which exhibited all the hallmarks of the great European witch hunts, including an unstable border between powerful nations, revolts against the lords, raging misogyny, confessions obtained under torture, and mass accusations. These past five centuries, only one account has been heard: that of the inquisitors and jurists, the same ones who invented the myth of flying witches who met with the devil at sabbats to plot their crimes.