The article is dedicated to the grammar of the French language, which is kept in the manuscript department of the Library of the Academy of Sciences (RO BAN, P I B, №106). The authorship of the manual is attributed to Ivan Gorlitsky (1690–1777). It was apparently intended for Princess Elizaveta Petrovna. The article supplements the information on this source in the works by S. V. Vlasov, L. V. Moskovkin (2013, 2017), N. V. Kareva and M. G. Sharikhina (2022). The allegation passed down from work to work about the originality of Gorlitsky’s work is disputed. Evidence shows that a significant part of the grammar text corresponds to the textbook “The true principles of the French Language” (1757) by V. J. Peyton; it is assumed that both texts go back to a common source. Other fragments of Gorlitsky’s grammar go back to F. de Fenne’s «Institutio linguae gallicae» (1680). The examples are generously taken from J.-R. Peplier’s textbook (1689). Special attention is paid to the peculiarities of the material adaptation to the Russian reader. It is pointed out that Gorlitsky often altered the examples and supplemented his text with information about the Russian language.