In the middle of the 15th century, the waters of the Lausanne lakes were flooded with bloodsuckers that afflicted the population of the city. To stop this misfortune, rich citizens asked for assistance from famous Heidelberg ecclesiastics. A criminal case was initiated against the contemptible creatures. Some of them were even brought to court to listen to the judgment. They were demanded to leave the lakes within three days. Ecclesiastics performed spells and rituals after which the bloodsuckers, as the annals claim, shamefully retired.
