Grand Duke Nicholas Constantinovich of Russia
Grand Duke Nicholas Constantinovich of Russia was the firstborn son of Grand Duke Konstantin Nikolayevich of Russia and Grand Duchess Alexandra Iosifovna of Russia and a grandson of Nicholas I of Russia.
Nikolai married Nadezhda Alexandrovna von Dreyer , daughter of Orenburg police chief Alexander Gustavovich Dreyer and Sophia Ivanovna Opanovskaya, in 1882. Two children were born from this marriage
Source: Wikipedia