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Who Were the Khazars?
https://www.chabad.org/library/article_cdo/aid/5804883/jewish/Who-Were-the-Khazars.htm
The Khazars were a semi-nomadic people who, in the late 6th century CE, established an empire covering the southeastern section of modern European Russia, southern Ukraine, Crimea and Kazakhstan. Sometime around the year 740 CE, the king and the ruling class, followed by members of the general population, decided to convert to Judaism. The kingdom of Khazaria long served as a buffer between the Christian Byzantine Empire and the Islamic Umayyad and Abbasid Caliphates. Not much is known about their early origins, and much of their history, including their decline, is shrouded in mystery.