период. [The Monetary Systems of the Russian Middle Ages. The Pre-Mongol Period]. Moscow, 1956. (2003 Russian translation online). External links Waugh, Daniel C. "Suggested Chronology of Events in the Pre-Kievan and Early Kievan Periods". States and territories established in the 830s States and territories disestablished in the 890s Former Slavic countries Khaganate Medieval Russia Medieval Ukraine Varangians