Prince John Constantinovich of Russia was a member of the imperial family and a decorated military officer. Born in Pavlovsk in 1886, he held the title of Prince of the Imperial Blood after a change in house laws reduced his status from Grand Duke. Known for his deep religious devotion, he served as a subdeacon and a choir director. Following the Russian Revolution, he was exiled to the Urals, where he was killed by Bolshevik authorities in July 1918 near Alapayevsk.