About the book: 2010 / The monograph examines the territorial and political changes in Rus' during the era of the “Horde yoke”, as a result of which, instead of more than a dozen principalities-“lands” that existed in the pre-Mongol period, two large states remained on the map of Eastern Europe - Moscow and Lithuania. The focus is on the ways in which the Russian princes, both Moscow and many others, carried out “conceptions” - annexing other political entities to their possessions. Consideration of all cases of “conceptions” in a complex allows us to draw conclusions about the nature of political processes on East Slavic territory in the Horde era. For historians and anyone interested in the history of Medieval Rus'.