This was an interesting article and offers the notion that the modern concept if Witch is not the same as it was before. Not sure how much I agree with the implied conclusion but on face value it seems correct:
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Well if Witches didn't exist where did Shakespeare come up with his idea of Witches and why did he put Hecate in there if it wasn't part of the old religions. I think what they were people who practice healing arts with herbs and spells. The Church didn't like them because they wanted people to pray for help and give the Church money rather than going to herbalist.
