Photograph of Grand Duke Constantine Nikolayevich (1827-92) and his eldest son Grand Duke Nicholas Constantinovich (1850-1918). Grand Duke Constantine is wearing military uniform and is sitting with his left arm around Grand Duke Nicholas who is standing beside him to the right. Both are holding a hat. Grand Duke Constantine Nikolayevich was the second son of Nicholas I, Emperor of Russia. During the reign of his brother Alexander II he reformed the Russian navy.