For the first time, the book publishes in full the memoirs of the aide-de-camp of Emperor Nicholas II A. A. Mordvinov. The first part, “In military court service,” covers the period before the outbreak of the First World War and is dedicated to childhood, training in the cadet corps, and the history of the Mordvinov family , serving as the personal adjutant of Grand Duke Mikhail Alexandrovich, and later Nicholas II. A special place in the memoirs is given to his communication with members of the imperial family in an informal setting, which allowed A. A. Mordvinov to sincerely fall in love with those whom he served faithfully and faithfully with devotion preserved in his heart until death. The publication expands and complements the range of sources on history Russia at the beginning of the 20th century, the House of Romanov, the last Emperor Nicholas II and one of the most tragic pages - his abdication and the death of the monarchy.