Helene Dolgoruki

Helene Dolgoruki or Elena Pavlovna Dolgorukaya, married name Fadeeva (1789–1860), was a Russian noblewoman who was the grandmother of both Sergei Witte and Madame Blavatsky. She took an interest in botany, collected and illustrated plants, coins, spoke several European languages, and corresponded with many scholars of the period including Alexander Humboldt, and Roderick Murchison.