What would be their history before they meet Macbeth? and why did they want to meet him in special?
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There isn't much said about these particular witches. They discuss doing spells on people that have pissed them off in the past. Apparently they have a witch goddess of sorts, Hecate, who they neglect to invite. Elizabethans were pretty versed on their witches so Shakespeare didn't need to do a history on them. They served a specific purpose for the Bard and that's exactly what he uses them for.