Mstislav Galitzine, Count Osterman (21 January 1899-28 February 1966), was a Russian prince belonging to the House of Golitsyn.
Mstislav Galitzine was born in Kyiv as the son of Alexander Mstislavovich Golitsyn and Anastasia Aleksandrovna Komovskaya.
[2] He joined Alexander Kolchak after the October Revolution but it is unclear if completed his education at the Page Corps; the sources disagree.
During World War II Galitzine lived in Saint-Jean-de-Luz, a seaside resort at the Atlantic coast in the Basque province, but died in Paris.
After his wife died (in Alexandria in 1934),[6] Leo moved to Hollywood where he was acting in various films as an extra, including in The Razor's Edge and The Chocolate Soldier.