Elena Petrovna Gan (Russian: Елена Петровна Ган, also Hélène, July 30 - July 31, 1831 (O.S.) (August 12, 1831 (N.S.)) Yekaterinoslav, Russian Empire — May 8, 1891 London), better known as Helena Blavatsky (Russian: Елена Блаватская) or Madame Blavatsky, born Helena von Hahn, was a founder of the Theosophical Society.
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