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Konstantinovichi
Prince Ioann Konstantinovich
Prince Ioann Konstantinovich was a great-grandson of Nicholas I. He was born at Pavlovsk Palace (1886). Married Princess Helen of Serbia and had two children – Vsyevolod (1914–1973) and Ekaterina (1915–2007). Murdered by the Bolsheviks in Alapayevsk in Siberia (1918).