First, I wouls like to mention that I am far from being an expert in genealogy.  I have a few comments which are mostly suggestions, not corrections. 

I am also attaching the following, which may be useful:
§ A few relevant pages from the 1997 Gotha (the Starke Verlag Gotha)
§ A “family tree” consisting of twe overlapping sheets. The source (“Europäische Stammtafeln”) is written on the left sheet. It was given to me in the present typed form during a visit to the Main Library in St. Petersburg. It’s a bit messy due to marginal comments, but it can be read when enlarged. The ancestors up to the Fieldmarshal’s father are shown. 

My comments are:

1. My own name is really Leo Sayn-Wittgenstein. “Lev Lvovich” is not wrong, but nobody ever uses it, except when addressing someone in Russia, (and then almost invariably without the surname). I would be inclined to  drop this Russian formulation Another argument would be consistency: we are not using this Russian forrmulation for my father, grandfather, etc
2. My father  is called Leon or  Leo on many documents, and on practically all documents from the last two or three decades of his life. “Ludwig (Leon)”, as in the Gotha is probably best. The Ludwig/Leo confusion arose, because he was supposed to be Ludwig, but was baptized in the Russian Orthodox church, which has no saints called “Ludwig” and therefore would not baptize a “Ludwig”.

3. My mother was born in Olmütz, which was then part of Austria. Today it is in the Czech Republic. I would suggest  substituting “Austria”,  or “then Austria”, or simply leaving it as “Olmütz” as the Gotha does.  It would be an almost impossible job to make all the corrections that would have to be made if we want to keep up with current changes in the names of countries. 

4. My grandmother. I would personally write Elisabeth  Nabokov or Elisaveta Dimitrievna Nabokov. The latter is used by Jaques Ferrand in “Les Nabokov”, probably the best genealogic work on the family.  I always find it confusing to write “Nabokova” when writing in a language other than Russian. The family name is Nabokov. I would spell it with a “v” and not a “w”, because this is the widely accepted spelling of the name. Vladimir Nabokov of “Lolita” fame was her nephew and there are now many books about the Nabokovs.

5. For the same reasons as above I would  use Leonilla Bariatinsky and not “Bariatinskaia” for the lady in the Winterhalter portrait. This I believe would also be more consistent with other references. 

6. Concerning “Leonille” or “Leonilla” Bariatinsky:  In her memoirs she decribes a visit by the Tsar when she was still a child. The Tsar came accompanied by Count Wittgenstein (the Fieldmarshal, and her future father in law). She refers to him as “the uncle of my mother” (in French). I see from  my second reference that the Fieldmarshal had a sister who married a Count  Keller. Leonille’s mother was a Countess Keller, so he probably was her mother’s uncle.

7. As shown in “Europäische Stammtafeln” Ludwig Adolf Friedrich (Leonille’s husband) was married twice. His first wife was Princess Stephanie Radziwill, who died and left him all of her enormous fortune.

Leo Sayn-Wittgenstein

Ottawa, April 2, 2026
 

Notes for Elisabeth Nabokov 1877-1942
(spouse of Heinrich, 2. Fuerst zu Sayn-Wittgenstein (1879-1919)