Abstract: The subject of the study is the perception by Baron E. F. Rosen - poet, playwright and critic, author of the libretto for the opera by M. I. Glinka "Life for the Tsar" (1836) - of the ideas of Slavophilism and pan-Slavism in the second half of the 1840s. The object of the study was two anonymous reviews of the Slavophile "Moscow Literary and Scientific Collection", published in 1847, the authorship of which was announced by Rosen himself during a printed discussion with S. P. Shevyrev about N. V. Gogol's book "Selected passages from correspondence with Friends" published in the same year. Other printed works by Rosen on the pages of the newspaper "Severnaya Pchela" and the magazine "Son of the Fatherland" are also used as material. The main research methods are hermeneutical and cultural-historical. Rosen's texts are considered in connection with the socio-political situation of the 1840s. The scientific novelty of the study lies in the introduction into scientific circulation of two texts not previously attributed to Rosen. The main conclusions of the study are as follows: 1) in 1847 Rosen treated the ideas of Slavophilism and pan-Slavism sharply negatively, but in 1848, apparently, against the background of news about revolutions in Western Europe, he drew closer to the Slavophiles in reasoning about the special beginning of the Russian people, "an unthinking sense of morality" opposed to Western European rationalism; 2) Rosen's differences with the Slavophiles were explained by his enlightening Westernism based on N. M. Karamzin and A. S. Pushkin; 3) the official ideology of the Nicholas reign imposed a certain imprint on Rosen's views; 4) the baron assigned a powerful civilizing role to the autocratic government.