Kevin Alan Brook: "The Rus princes even borrowed the title kagan. Archaeologists recovered a variety of Khazar or Khazar-style objects (including clothing and pottery) from Viking gravesites in Chernigov, Gnezdovo, Kiev, and even Birka (Sweden). The residents of Kievan Rus patterned their legal procedures after the Khazars. In addition, some Khazar words became part of the old East Slavic language: for example, bogatyr 'brave knight' apparently derives from the Khazar word baghatur."

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