About the book: 2016 / Notes of Jacob Ivanovich de Sanglein (1776–1864), a statesman and one of the leaders of political investigation under Alexander I, first appeared in printed on the pages of “Russian Antiquity” in 1882–1883, almost twenty years after the author’s death. De Sanglen’s memoirs, which clearly demonstrate the technology of political intrigue, immediately after publication became the most important historical source, taking into account the personality of the author and his role in the events of that time, his knowledge of all the secret springs of the mechanism of functioning of the state machine and decision-making by the highest officials of the empire. Published according to the publication: Notes Yakov Ivanovich de Sanglen // Russian antiquity. T. XXXVII. St. Petersburg, 1883. Issues 1–3. Intro. Art. and comment. V. M. Bezotosny.