Prince Piotr Sergeyevich Troubetskoy

https://genealogics.org/getperson.php?personID=I00077002&tree=LEO

Russian Prince. Cavalry captain. A pupil of the Page Corps in 1898. He also attended the Page Corps, then entered the Preobrazhensky Regiment, was the aide-de-camp of Grand Duke Mikhail Nikolaevitch from 1855, became a General Major 1866, then Lieutenant General. When he returned to civil service, he became a State Councillor, then Grand Marshal of the Court, then starting in 1892 as the director of the Hermitage.