Temnikovskaya zaseka: border service and frontier line in the defense system of the “Ukraine” of the Russian state in the 16th - first third of the 18th century

Introduction. The Temnikovskaya Zaseka is the least studied part of the Great Zasechnaya Line, highlighting the relevance of introducing its preserved archival descriptions into scientific circulation and analyzing the border and guard services in this area of the Mordovian region (in the interfluve of the Sura, Moksha, and Tsna rivers). The purpose of the study is to provide a comprehensive analysis of the Temnikovskaya Zaseka within the system of defense of the Russian state in the 16th-17th centuries.