The monograph examines the complex of problems of the historical development of the Severshchina in the KhIU-KhU art., When it, like most Ukrainian lands, was part of the Lithuanian state. Significant attention in the study is paid to the analysis of the term "Severshchina" and clarification of its genetic connections. The evolution of the political and administrative structure of the region is traced in detail. Fundamental trends in the socio-economic development of the Seversky land in the Lithuanian era are described. Against the broad background of interstate (mainly Lithuanian-Horde and Lithuanian-Moscow) relations, the political processes of this period were considered.