The Khazaran reference article from the English Wikipedia on 24-Apr-2004
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Khazaran

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Khazaran was a city east of Atil in the Khazar kingdom, connected to the latter by a pontoon bridge.

Khazaran was later inhabited primarily by Muslims and featured numerous mosques, minarets, and madrasas. It was a bustling trade center easily reachable by ship from the Caspian Sea and Volga River, and many of its inhabitants were crafters, fishers, and traders. The leader of the city was a Muslim official known as the vizier.