LeCretzia Borgia and Marie Antoinette

Lucaatia Borgia is accused of being a kind of arch-poisoner. Was it an unusual amount of murdering for an Italian Renaissance family? That I don't know. Cesare is sort of murdered his own brother, which I think may be a bit extra. But we've been stuck with the black legend of LeCretzia. So we don't like to believe that she did some murder ring.