Prince John Konstantinovich of Russia

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Prince John Constantinovich
Born	(1886-07-05)5 July 1886 Pavlovsk Palace, Pavlovsk, Saint Petersburg, Russian Empire
Died	18 July 1918(1918-07-18) (aged 32) Alapayevsk, Russian SFSR
Spouse	Princess Helen of Serbia ​ ​ (m. 1911)​
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 Konstantonovich of Russia, born as Grand Duke John Konstantinovich of Russia (Russian: Иоанн Константинович; 5 July 1886 – 18 July 1918), sometimes also known as Prince Ivan or Prince Ioann or Prince Johan, was the eldest son of Grand Duke Konstantin Konstantinovich of Russia by his wife, Yelizaveta Mavrikievna, née Princess Elisabeth of Saxe-Altenburg. He was described by contemporaries as a gentle, religious person, nicknamed "Ioannchik" by his relatives.