01 November 1538,
The Spanish inquisitor came to Bizkaia. Fernando de Valdeolivas made a stay until August of the following year to investigate the existence of witchcraft outbreaks in the commissions. By the time he came, they had about 30 women in prison, believing they were witches.
The persecution cost him so much that he had to ask for help from Valdezabal, the inquisitor of Calahorra. In total there were 51 defendants, 33 of them women. They were tortured and forced to pay a fortune.
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).