​BLAVATSKY, HELENE PETROVNA, a noted theosophist, born in Yekaterinoslav, Russia, in 1831; founded the Theosophical Society in New York in 1875, and wrote "Isis Unveiled" (1876); "The Secret Doctrine" (1888); "Key to Theosophy" (1889), etc. She died in London, May 8, 1891.