LTReikšminiai žodžiai: Baltai; Istoriografija; Kunigaikščiai; Lietuvos Didžioji Kunigaikštystė (LDK; Grand Duchy of Lithuania; GDL); Mindaugas; Naugardukas (Navahrudak); Slavai; Valstybė; Valstybės formavimasis; Balts; Dukes; Historiography; Slavs; State formation.
ENThe objekt of the research: the process of the Great Lithuanian Duchy creation in the second half of the 13 - beginning of the 14 century. The purpose of the work: creating the Great Lithuanian Duchy genesis concept adequate to modern level of history awareness. Methodology basis of the research: investigating the process of statehood creation through its mutual connection with the process of Balto-Slavic contacts on the territory of Panyamonne. The historiography analysis of the problem has shown the presence of two variants of the Great Lithuanian Duchy genesis concept, based on the thesis of Balto-Slavic confrontation. According to the first variant the aforesaid state creation is the result of the Baltic tribes of Lithuanians conquest of East-Slavic territories in the Neman, the Dvina and the Dnieper rivers basin. According to the second variant (the author is M.Yermalovitch), the beginning of the state was the conquest of the Baltic Lithuania by the East-Slavic city-state Navagradak. The study of the process of Balto-Slavic contacts on the core territory of the state -Upper Panyamonne (historical Lithuania), undertaken by archeologists, linguists, ethnographers has shown the peaceful, but not confrontational nature of Balto-Slavic relationships. The creation of the state (GLD) in the zone of Balto-Slavic contacts did not change the nature of inter-ethnical interaction process, its essence being the consistent peaceful assimilation of the Balts by Eastern Slavs. The author came to a conclusion that the aforesaid state genesis can be dwelt upon as an organic part of peaceful Balto-Slavic interaction and that the Great Lithuanian Duchy had been a biethnic state formation with the dominance of East- Slavic element from the very beginning. [From the publication]