Prince Ioann Konstantinovich of Russia , sometimes also known as Prince John, Prince Ivan 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.
Background
Ioann Konstantinovich was born as a Grand Duke of Russia with the style Imperial Highness, but at the age of 9 days, a Ukaz of his cousin Emperor Alexander III of Russia stripped him of that title, as the Ukaz amended the House Law by limiting the grand-ducal title to grandsons of a reigning emperor.
Career
He was described by contemporaries as a gentle, religious person, nicknamed "Ioannchik" by his relatives. As a result he received the title Prince of the Imperial Blood (Prince of Russia) with the style Highness. He once entertained the possibility of becoming an Orthodox monk, but eventually fell in love with Princess Helen of Serbia.
Prince Ioann fought in the First World War, was decorated as a war hero, and was at the front when the Russian Revolution of 1917 started.
His body was eventually buried in Beijing, in the cemetery of the Russian Orthodox Mission, which was destroyed years later to build a park. Yekaterina lived in Buenos Aires and later in Montevideo, Uruguay where she died in 2007.
5 July 1886 – 14 July 1886: His Imperial Highness Grand Duke Ioann Konstantinovich of Russia
14 July 1886 – 18 July 1918: His Highness Prince Ioann Konstantinovich of Russia.