Witches, wizards and warlocks?

Look up some of the famous subjects -- Dr. John Dee, Cornelius Agrippa. Start by looking up the famous novel by Apuleius the Golden *** (its name is always censored here). Magic and spells used to play an important role in everyone's spiritual life, so witch in some Roman literature is sometimes a translation of Priestess (it's a Thracian Witch whose spell goes awry turning the hero of that novel into a donkey). A lot of the people, such as Pope Sylvester II who are alleged to have been witches or wizards are people people had grudges against.