Grand Duke Nicholas Nikolaevich of Russia (Russian: Николай Николаевич Романов (младший – the younger); 18 November 1856 – 5 January 1929) was a Russian general in World War I (1914–1918). The son of Grand Duke Nicholas Nikolaevich of Russia (1831–1891), and a grandson of Emperor Nicholas I of Russia, he was commander in chief of the Imperial Russian Army units on the main front in the first year of the war, during the reign of his first cousin once removed, Nicholas II. Although held in high regard by Paul von Hindenburg, he struggled with the colossal task of leading Russia's war effort against Germany, including strategy, tactics, logistics and coordination with the government. After the Gorlice–Tarnów offensive in 1915, Tsar Nicholas replaced the Grand Duke as commander-in-chief of the army. He later was a successful commander-in-chief in the Caucasus region. He was briefly recognized as the Emperor in 1922 in areas controlled by the White Armies movement in the Russian Far East. Biography Family A very tall man (1.98m / 6' 6"), Nicholas, named after his paternal grandfather, the emperor, was born as the eldest son to Grand Duke Nicholas Nicolaevich of Russia (1831–1891) and Alexandra Petrovna of Oldenburg (1838–1900) on 18 November 1856. His father was the sixth child and third son born to Nicholas I of Russia and his Empress consort Alexandra Fedorovna of Prussia (1798–1860). Alexandra Fedorovna was a daughter of Frederick William III of Prussia and Louise of Mecklenburg-Strelitz. Nicholas's mother, his father's first cousin's daughter, was a daughter of Duke Konstantin Peter of Oldenburg (1812–1881) and Princess Therese of Nassau (1815–1871). His maternal grandfather was a son of Duke George of Oldenburg and Grand Duchess Catherine Pavlovna of Russia, daughter of Paul I of Russia and Maria Fedorovna of Württemberg. (Catherine was later remarried to William I of Württemberg.) His maternal grandmother was a daughter of Wilhelm, Duke of Nassau (1792–1839) and Princess Luise of Saxe-Hildburghausen. The Duke of Nassau was a son of Friedrich Wilhelm, Duke of Nassau (1768–1816) and Burgravine Louise Isabelle of Kirchberg. His paternal grandparents were Duke Karl Christian of Nassau-Weilburg (1735–1788) and Carolina of Orange-Nassau. Carolina was a daughter of William IV of Orange and Anne, Princess Royal and Princess of Orange. Anne was the eldest daughter of George II of Great Britain and Caroline of Ansbach. Grand Duke Nicholas was the first cousin once removed of Tsar Nicholas II.