This book traces the history of the ancient Khazar Empire, a major but almost forgotten power in Eastern Europe, which in the Dark Ages became converted to Judaism. Khazaria was finally wiped out by the forces of Genghis Khan, but evidence indicates that the Khazars themselves migrated to Poland and formed the cradle of Western Jewry. To the general reader the Khazars, who flourished from the 7th to 11th century, may seem infinitely remote today. Yet they have a close and unexpected bearing on our world, which emerges as Koestler recounts the fascinating history of the ancient Khazar Empire. At about the time that Charlemagne was Emperor in the West. The Khazars' sway extended from the Black Sea to the Caspian, from the Caucasus to the Volga, and they were instrumental in stopping the Muslim onslaught against Byzantium, the eastern jaw of the gigantic pincer movement that in the West swept across northern Africa and into Spain. Thereafter the Khazars found themselves in a precarious position betwen the two major world powers: the Eastern Roman Empire in Byzantium and the triumphant followers of Mohammed. As Koestler points out, the Khazars were the Third World of their day. They chose a surprising method of resisting both the Western pressure to become Christian and the Eastern to adopt Islam. Rejecting both, they converted to Judaism. Mr Koestler speculates about the ultimate faith of the Khazars and their impact on the racial composition and social heritage of modern Jewry. He produces a large body of meticulously detailed research.