S.P. Melgunov is the most prominent historian of the Russian diaspora, and perhaps of all Russian science of the 20th century, on these issues. Before the revolution, he was a recognized authority on the history of the Russian church, especially the Old Believers and sectarianism. Under his editorship, multi-volume collective works were published, which are the pride of Russian historiography: “The Great Reform of February 19, 1861.” (7 volumes), “Patriotic War and Russian Society” (6 volumes), “Freemasonry in its past and present” (3 volumes). In 1913, together with V.I. Semevsky, Melgunov organized the largest Russian historical magazine “The Voice of the Past” and edited it for 10 years (65 volumes were published). The trilogy “Revolution and the Tsar” includes the books “The Legend of a Separate Peace. The Eve of the Revolution” ", "March days of 1917", "The fate of Emperor Nicholas II after the abdication. Historical and critical essays." They make up a vivid chronicle of the rebellious years that turned the fate of Russia, full of the living breath of time. This chronicle is distinguished by the richest use of historical sources, an objective assessment of what happened, the journalistic heartbeat of the author's thoughts, and documentary photographs.