24 June 1607,
Twelve masked knights beat the inhabitants of San Juan de Luz. The origin of the aggression was the confrontation between the cacique Urtubia de Urruña and the authorities of San Juan de Luz, for the competences of the port and the bridge of Ziburu. During the conflict there were cross-denunciations of witchcraft and, due to pressure from Urtubia, Enrique, king of Navarra and France, sent Pierre De Lancre to investigate the spells of Lapurdi. So began the huge witch hunt in the North. De Lancre was a descendant of Basques, but he hated the Basque and the Basque Country. He arrested hundreds of citizens and sent 60 fires. In Euskal Herria, from the first execution of the documented inquisition (1329) to the last (1610), between 200 and 323 people died, mostly women and all "by law".
Source:
José Dueso, Hunting for witches in the Basque Country through its main judicial processes (Vaccine).