The book considers the ethnogenesis of Naymans on the basis of the history of Proto-Turkic and Turkic tribes of the early state associations of Central Asia. Comparison of medieval historical chronicles, and researches of modern scientists allowed to reveal genealogy of the tribes known as Naimans in the historical and chronological perspective from Uigur Kaganate to the Shagatayid state.Systematization of the historical material, diverse in content and interpretation, allowed to present the history and role of Naimans in the Early and Late Middle Ages in the most scientifically accurate form .