It is based on the analysis of the texts of the most important works of the time and the results of archaeological excavations. The author examines the historical sources of the period and attempts to reconstruct the ethnic composition of the population of Eastern Europe in the early Middle Ages. The book is intended for historians orientalists and all those interested in the history of Eastern Europe. The plot of the book "Каспийский свод сведений о Восточной Европе Том 1 [Горган и Поволжье в IXX вв] + Том 2 [Булгары мадьяры народы Севера печенеги русы славяне]" by BN Zakhoder is a comprehensive study of the history of the origin and development of the Caspian region, specifically the area between the Volga and Caucasus rivers, during the 9th-10th centuries. The book is divided into two volumes, with Volume 1 focusing on Gorgan and the Volga region, while Volume 2 explores the history of the Bulgars, Magyars, Pechenegs, and Rus Slavs.

''