I've been really interested lately in the Dolgoruki family and it's influence ..
Children of Helene Dolgoruki and Andrei Fadeyev:
Helena Fadeyev, (1814-42), noted author of 12 books, (writing as Zenaida R.) and wife (in 1830) of Peter Hahn, parents of Blavatsky. Her books included: The Ideal, Utballa, Jelalu'd-din, Theophania Abbiadjio, Medallion, Lubonka, A Box at the Odessa Opera, The World's Judgment, and a Fruitless Gift. She is the subject of a biographical sketch by Catherine Nekrasova in the magazine Russian Days of Yore, and also one by Bobritsky. 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.
From Wikipedia
http://en.wikipedia.org/wiki/Helene_Dolgoruki
Also there was some influence and contact with the American author Washington Irving by a Prince Dolgoruki and influence in the early history of the Baha'i Faith as well.. I'll add that later..