- Born
- Died
- Birth nameIoann Konstantinovich Holstein-Gottorp-Romanov
- John Constantinovitch was born on July 5, 1886 in Pavlovsk, Saint Petersburg, Russian Empire. He was married to Princess Helena. He died on July 18, 1918 in Alapayevsk, Sverdlovsk Oblast, Russia.
- SpousePrincess Helena(August 21, 1911 - July 18, 1918) (his death, 2 children)
- RelativesKing Constantine(Cousin)Queen Olga(Aunt or Uncle)
- Son-in-law of King Peter of Serbia.
- Brother-in-law of King Alexander of Yugoslavia.
- Born as a Grand Duke of Russia with the style Imperial Highness, but was stripped of that title when he was 9 years old via a decree by his cousin Emperor Alexander III, who decided to limit the title of "Grand Duke" to grandsons of the reigning emperor. Constantinovitch received the title Prince of the Imperial Blood with the style Highness.
- Murdered by the Bolsheviks, along with: his brothers Prince Constantine and Prince Igor; their cousin Prince Vladimir Pavlovich Paley; Grand Duchess Elizabeth Feodorovna (granddaughter of Queen Victoria and Prince Albert); Grand Duke Sergei Mikhailovich (cousin of Czar Aleksandr III); Sergei's secretary; and Varvara Yakovleva, a sister from the Grand Duchess's convent.
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