The article examines the influence of the mythologeme of the pan-European conspiracy, created and existing among the Russian political elite of the first quarter of the 19th century, on the perception of what is happening in the Kingdom of Poland and the policy pursued there by the Russian autocracy. Letters from A.A. Arakcheev, Grand Duke Konstantin Pavlovich, I.V. Vasilvichkova, A.P. Eromolov about the involvement of the conspirators in the uprising of the Semyonovsky regiment only increased the pressure on the emperor and his perception of political reality. This fear of a pan-European revolution influenced the political discourse of the Russian Empire and became one of the reasons for Alexander I's curtailment of support for constitutional reforms both in Europe and in the Kingdom of Poland. The emperor, although he wanted to continue his liberal policy, was limited by his fears of conspiracies, which were constantly exaggerated by representatives of the political elite. The analysis of the French mass media in this paper, which was the dominant Russian information field in the 19th century, shows, during the period under review, the fears of the emperor and the elite intensified even despite the absence in the European political discourse of reports of any impending conspiracies in Poland and even criticism of the emperor himself.