Prince John Konstantinovich of Russia
| Prince John Constantinovich | |
|---|---|
Prince Ioann Konstantinovich of Russia in his military uniform of the Imperial Russian Army (1908) | |
| Born | 5 July 1886 Pavlovsk Palace, Pavlovsk, Saint Petersburg, Russian Empire |
| Died | 18 July 1918 (aged 32) Alapayevsk, Russian SFSR |
| Cause of death | Murder |
| Spouse | |
| Issue | Prince Vsevolod Ivanovich Princess Catherine Ivanovna |
| House | Holstein-Gottorp-Romanov |
| Father | Grand Duke Constantine Constantinovich of Russia |
| Mother | Princess Elisabeth of Saxe-Altenburg |
Prince John Konstantinovich of Russia, formerly Grand Duke John Konstantinovich of Russia (Russian: Иоанн Константинович; 5 July 1886 – 18 July 1918), sometimes also known as Prince Ivan, Prince Ioann or Prince Johan, was the eldest son of Grand Duke Konstantin Konstantinovich of Russia and Yelizaveta Mavrikievna, née Princess Elisabeth of Saxe-Altenburg. He was described by contemporaries as a gentle, religious person, nicknamed "Ioannchik" by his relatives.