The scientific monograph is devoted to the problem of the role of ethno-political factors in the consolidation of the nomadic tribes of Pityanshan and Sayano-Altai in the VIII-XIV centuries. The book broadly covers the problems of origin and formation of the Kyrgyz ethnos. It analyzes migration processes ethno-political ethnogenetic ethno-cultural relations of the Yenisei Kyrgyz with neighboring nomadic tribes and states in the Middle Ages. The book is intended for historians ethnographers archaeologists and other specialists as well as a wide range of readers interested in the ancient and medieval history of Central Asia.