Does your country have a black legend figure?

As black legend, I mean someone who has been remembered in negative terms but often because of a defamatory campaign during or after their lifetime or because historians needed to depict their time period in a negative way.

In Italy this figure would be Lucrezia Borgia, daughter of Pope Alexander VI and sister of Cesare, two of the most infamous and important figures in the Renaissance. She has acquired a sinister fame as a poisoner and a schemer, on account of the death of her first 2 husbands, but it's likely that she had to endure her father's and brother's power schemes and that she wasn't really involved in any of the murders.