The emperor Charlemagne decreed that the burning of supposed witches was a pagan custom that would be punished by the death penalty. In 820 the Bishop of Lyon and others repudiated the belief that witches could make bad weather, fly in the night, and change their shape. This denial was accepted into Canon law until it was reversed in later centuries as the witch-hunt gained force.Other rulers such as King Coloman of Hungary declared that witch-hunts should cease because witches (more specifically, strigas) do not exist.