Princess Jelena Karađorđević (1884-1962) Serbia was known as Elena, Jelena, Hélène (Helen) Petrovna after her marriage to Prince John Constantinovich Romanov (1886-1918) of Russia. Daughter of King Peter I of Serbia & Princess Zorka of Montenegro. John was murdered in 1918 with his brothers & other family in a mine shaft & His wife Helen Petrovna left Russia in April 1919 with help from the King of Norway.
Nicholas Constantinovich and his wife Nadejda von Dreyer.
*NICHOLAS II ~ The last Tsar of Russia, born: May 18, 1868, Alexander Palace, Tsarskeye Eelo Saint Petersburg, Russian Empire. Death: July 17, 1918 (aged 50), Yekaterinburg, Russian SFSR. Burial July 17, 1998, Peter + Paul Cathederal, Saint Petersburg, Russian Federation.