Prince Oleg Konstantinovich was the fourth son of Grand Duke Konstantin Konstantinovich (KR), born 27 November 1892 (N.S.).
In 1913 he graduated from school and was enrolled as cornet in the Hussars. From the first days of the war he served in the army in East Prussia. Read more ROMANOV FAMILY COUSIN: PRINCE OLEG KONSTANTINOVICH (1892-1914)