Wikipedia describes Vera Renczi (a.k.a. Black Widow or Chatelaine of Berkerekul) as
a Romanian serial killer who allegedly confessed to poisoning 35 individuals including her two husbands, multiple lovers, and her son with arsenic during the 1920s.
The page acknowledges that the verifiability of the sources is disputed, and the corresponding talk page has people claiming her existence is fictional.
I am writing an article about her and I am confused as to whether she ever existed.
Did a woman matching her description (e.g. killed over 30 men in the Balkans, and kept them in coffins in her basement) exist?
I am thinking that perhaps her last name or town got lost in translation since this allegedly took place in or around Bucharest.