Grand Duke Boris Vladimirovich of Russia was a son of Grand Duke Vladimir Alexandrovich of Russia, a grandson of Tsar Alexander II of Russia and a first cousin of Tsar Nicholas II.
He followed a military career. Wikipedia
Born: November 24, 1877, Saint Petersburg, Russia
Died: November 9, 1943 (age 65 years), Paris, France
Children: Boris Lacroix
Partner: Zinaida Rashevskaya (1919–)
Grandparents: Alexander II of Russia, Maria Alexandrovna, Frederick Francis II, and more
Great-grandparents: Nicholas I of Russia, Alexandra Feodorovna, Princess Wilhelmine of Baden, and more