He was also interested in finding new forces as a means for providing scientific explanations for spiritualist, occult and other allegedly supernatural phenomena following his disenchantment with Helena Blavatsky's Theosophy.
His legacy includes several publications, including elucidations of the writings of Helena Blavatsky.
Sergei Witte wrote that his grandfather, P.V. Dolgorukov, during his daughter’s marriage had blessed his daughter and new son-in-law with an ancient cross which, according to family legend, belonged to the Grand Prince of Kiev, St. Michael of Chernigov.
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Their daughter, Ekaterina Andreevna, was the mother of the well-known Russian statesman, Sergei Witte.
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Sergei Grigor’evich was the great grandfather of Helena Pavlovna Fadeyeva-Dolgorukaya (H.P. Blavatsky’s grandmother and also the grandmother of Count Sergei Witte) and great-great-great-grandfather of Helena Petrovna Blavatsky.
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Later, this cross passed into the hands of Helena Pavlovna and further to Sergei Witte.
He translated all of Helena Blavatsky's work to Spanish and wrote a large set of his own books.
It is referenced in multiple locations in works of Helena Blavatsky.
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Along with Henry Steel Olcott and Helena Blavatsky, the creators of the Theosophical Society, he was a major reformer and revivalist of Ceylonese Buddhism and very crucial figure in its Western transmission.
Peter von Hahn (1799–1875), member of the Russian nobility, remembered in the United States mainly as the father of Helena Blavatsky.
The founders of the Theosophical Society, Helena Blavatsky and Henry Steel Olcott, were influenced by Eastern religions, then placed their headquarters in Adyar, Chennai, from where they spread their views within India.
The scholar K. Paul Johnson maintains that the "Masters" that Helena Blavatsky wrote about and produced letters from were actually idealizations of people who were her mentors.
Both of her surviving children also became authors, Helena Blavatsky most famously as the founder of the Theosophical Society in 1875, and her sister Vera Zelihovsky as a writer of children's stories.