Sergei Sergeevich Oldenburg was an erudite and connoisseur of history, and that is why the Supreme Monarchical Council instructed him to write the history of the reign of Emperor Nicholas II. The author had access to unique documents. Copies of the originals of authentic historical acts of the Russian Empire, as a precaution, began to be sent for storage to the Russian embassy in Paris long before the First World War. An in-depth study of the history of Russia at the end of the 19th and beginning of the 20th centuries. creates a multifaceted, complete image of a powerful power with all its economic, political, and social upheavals.