When I was little, in the age of Hitler, Mussolini, and Tojo, I wondered if history afforded any *women* of superlative wickedness. My mother thought a moment & suggested Lucrezia Borgia. It seems from Wikipedia that she had enemies who made up a lot of stuff about her for which there is no evidence. However, it turns out that there is also an opera about her in which she poisons five people. Perhaps there is a song in that.