The Jews of Khazaria chronicles the history of the Khazars, a people who, in the early Middle Ages, founded a large empire in eastern Europe (located in present-day Ukraine and Russia). The Khazars played a pivotal role in world history. Khazaria was one of the largest-sized political formations of its time, an economic and cultural superpower connected to several important trade routes. It was especially notable for its religious tolerance, and in the 9th century, a large portion of the royal family converted to Judaism. Many of the nobles and commoners did likewise shortly thereafter.