Prince Constantin Constantinovich of Russia (1891-1918) was the third son and fourth child of Grand Duke Konstantin Konstantinovich of Russia by his wife Grand Duchess Elizabeth Mavrikievna of Russia.
He served in the army during the First World War. A priest who met him at the front, Hegumen Seraphim, wrote: "He was an extremely modest officer of the Guard of the Izmaylovsky Regiment, much beloved by officers and soldiers alike; along with them, he was a brave soldier who distinguished himself. I remember seeing him in the trenches among the soldiers, risking his life."















