Nikolai Ottovich von Essen was born on in St. Petersburg, Russia to Imperial Senator Otto Vilgelmovich von Essen, into the wealthy noble family of Essen. Early on in his life, Essen received home education, he was well-educated and fluent at English, French, Russian, and of course, his native languageGerman. He graduated from the Naval Cadet Corps in 1880, after a two-year foreign cruise, attended the engineering department of the Nikolayev Naval Academy from 1883 to 1886. He was commissioned as a lieutenant in 1891 and served with the Russian Pacific Fleet from 1892 to 1896, and with the Russian Mediterranean Squadron from 1897. In the early part of his career, he commanded Minesweeper No. 120, the gunboat Grozyachiy, and the steamship Slavianka in the Black Sea. After a brief assignment as an instructor at the Naval Cadet Corps, he was appointed captain of the cruiser , which was stationed at Vladivostok. At the start of the Russo-Japanese War, Admiral Stepan Makarov reassigned Essen to command the battleship at Port Arthur. After the disastrous Battle of the Yellow Sea, Essen also commanded the land-based defences at the entrance to Port Arthur. During the last weeks of the Japanese siege, he moved Sevastopol out of the relative safety of the inner harbour to use her firepower to help repulse repeated Japanese attacks. However, on hearing of the surrender of Port Arthur, he moved Sevastopol into deeper water and then scuttled her, making her the only battleship that the Imperial Japanese Navy could not raise after the war. He was sent as a prisoner of war to Japan, but was paroled after less than two months, and returned to St Petersburg to a hero’s welcome. For his actions, Essen was awarded the Order of St. George and promoted to captain. After the end of the war, Essen became the first captain of the British-built armoured cruiser. He was promoted to rear admiral in 1908 and appointed commander-in-chief of the Russian Baltic Fleet in 1909 when this position was created. He was promoted to admiral in 1913. Essen, from lessons learned in the war against Japan and the mutiny of the Black Sea Fleet, urged far-reaching reforms and modernisation of the Imperial Russian Navy. He recognised early the importance of submarines and aircraft, and sought to promote younger officers based on their knowledge of modern strategy and tactics, also establishing a naval training academy at Kronstadt. Above all, he pushed for the operational autonomy of the Baltic Fleet. Widely regarded as the most able of Russian admirals in World War I, Essen led the Baltic Fleet energetically during the first year of the war. His forces at the time consisted of four battleships, five cruisers, four light cruisers, 62 torpedo boats, 12 submarines and numerous smaller and specialised units. His superiors preferred a cautious defensive position in the Baltic Sea, forcing Essen to concentrate his forces in the Gulf of Finland to protect Petrograd, with older units in the Gulf of Riga, and effectively abandoning Liepāja to the Germans. Nevertheless, on 9 August 1914, Essen led part of his fleet towards Gotland with the intent to contain the Swedish navy and deliver a note of his own making which would have violated Swedish neutrality and may have brought Sweden into the war. He was ordered back before his plan could be executed. However, on 27 August 1914, he assigned Rurik and to commerce raiding operations in the Baltic. Although of little success, the mission went a long way towards maintaining morale within the Baltic Fleet. Essen died unexpectedly after a short bout of pneumonia in May 1915. He is buried in the Novodevichy Cemetery. He was survived by his wife, Mary, and son Anthony, and two daughters who married naval officers.