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Wikipedia definition
1. Prince John Constantinovich of RussiaPrince John Constantinovich of Russia (5 July 1886 – 18 July 1918), sometimes also known as Prince Ioann, Prince Ivan or Prince Johan, was the eldest son of Grand Duke Constantine Constantinovich of Russia by his wife Elisaveta Mavrikievna, née Princess Elisabeth of Saxe-Altenburg. He was described by contemporaries as a gentle, religious person, nicknamed Ioannchik by his relatives.
Read “Prince John Constantinovich of Russia” on English Wikipedia
Read “イオアン・コンスタンチノヴィチ” on Japanese Wikipedia
Read “Prince John Constantinovich of Russia” on DBpedia

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