The Thirteenth Tribe by Arthur Koestler

This book discusses the Khazar Empire, a Turkic kingdom that existed in Eastern Europe between the 7th-11th centuries. At its height, the Khazar Empire played a significant role in shaping medieval Europe by blocking the Arab conquest and preventing the Muslim domination of Eastern Europe. In the 8th century, the Khazar ruling class converted to Judaism, which surprised historians. After the fall of the Khazar kingdom, some historians hypothesize that many Eastern European Jews may have descended from the Khazars rather than the ancient Israelites.
The book states that the true ancestors of western jewry were not semites, but rather the warrior empire of the khazars, a mighty power that converted to judaism in the dark ages, and whose subsequent exodus gave birth to the main stream of the jewish people as they now exist

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