Prince John Konstantinovich of Russia, formerly Grand Duke John Konstantinovich of Russia, sometimes also known as Prince Ivan, Prince Ioann or Prince Johan, was the eldest son of Grand Duke Konstanti
Prince Ioann Konstantinovich of Russia in his military uniform of the Imperial Russian Army (1913)
Prince Gabriel Constantinovich of Russia was the second son of Grand Duke Konstantin Konstantinovich of Russia and his wife, Grand Duchess Elizabeth Mavrikievna of Russia. A great-grandson of Tsar Nic
Gabriel in the uniform of His Majesty’s Life Guards Hussar Regiment, 1912.
Prince Gabriel Constantinovich with his family. From left to right; Prince George, Prince Igor, Prince Oleg, Prince Constantine, Princess Tatiana, Prince Gabriel, Prince Ioan, Grand Duchess Elisabeth Mavrikievna and Grand Duke Konstantin, 1905
Prince Gabriel Constantinovich in his youth
Prince Gabriel Constantinovich in uniform