Estella: Bathory
Most commonly, "Estella Bathory" is a confusion or conflation of (the 16th-century Hungarian noblewoman and alleged serial killer) with the name Estella (perhaps from Dickens' Great Expectations or simply a variation of Elizabeth).
Start with the work of Aleksandra Vuković if you want the hard history. Start with Katherine O'Donnell if you are interested in the horror legend. estella bathory
