The grandparents were Andrei Mikhailovich Fadeyev (1789-1867), Imperial Councillor to the Viceroy of the Caucasus, and his wife Helene Dolgoruki (1789-1860). She married firstly on 7 Jul 1848 in Tiflis, Russia to Nikifor Vasilievich Blavatsky, the Vice-Governor of Erivan.
She first met [[Henry Steel Olcott]] at the [[Eddy Family|Eddy Homestead]] where they were both attending a series of spiritualistic exhibitions. See [http://books.google.com/books?id=ruzy2w1ba0kC&printsec=titlepage#PPA293,M1 here] where their meeting is described by Henry.
She first met [[Henry Steel Olcott]] at the [[Eddy Family|Eddy Homestead]] where they were both attending a series of spiritualistic exhibitions. See [http://books.google.com/books?id=ruzy2w1ba0kC&printsec=titlepage#PPA293,M1 here] where their meeting is described by Henry as occuring on 14 Oct 1874.
In 1875, with [[Henry Steel Olcott]] and [[William Quan Judge]], she was a founder of the [[Theosophical Society]] in New York City. She married on 3 Apr 1875 in Philadelphia to Michael C Betanelly. In Dec 1878, Blavasky and Olcott immigrated to India. She later immigrated to England where she died 8 May 1891 in London, Middlesex, England.
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