March 25, 1851 - Mária Gerzsány
Operating in a rural Hungarian town over roughly six years, she worked not only as a killer but apparently as a supplier — selling arsenic to others seeking to eliminate family members, which suggests her reach extended well beyond the three deaths for which she was convicted. The life sentence she received reflected the courts' certainty, even as the full scope of her activity remained difficult to establish.
From Wikipedia
Mária Gerzsány (March 25, 1851 – December 30, 1928) was a serial killer in Austria-Hungary responsible for poisoning at least three people with arsenic in Kistelek between 1905 and 1911. She was sentenced to life imprisonment for these murders, but it is presumed that she may have been responsible for more, selling her poisons to people who wished to get rid of unwanted relatives.
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