This paper consists of three parts: 1. The current state of research on Ivan Lobojko’s memoirs (comments of Samuel Fishman, Abram Reytblat, Marya Prussak, Reda Gruskaite); 2. The biography of Ivan Lobojko (born 1786 in Charkov, died 1861 in Mitau) and his contacts with Polish scientists (the community of Vilnius University, Samuel Bogumił Linde, Joachim Lelewel and others); 3. Two approaches to the subject “Ivan Lobojko in the Polish scientific community on the basis of his memoirs” (I. Lobojko, Moi vospominaniya. Moi zapiski, ed. A.I. Rejtblat, Moscow 2013): a) the “external” method – “The Poles about Lobojko”, a comparison of Lobojko’s memoirs and Poles’ memoires (A.H. Kirkor, A. Malinowski, T. Dobszewicz), b) the “internal” method – “Lobojko about the Poles”, a reconstruction of the profiles of Polish scientists in Lobojko’s memoirs (Zorian Dołęga Chodakowski and others).