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Kievan Rus, first East Slavic state. It reached its peak in the early to mid-11th century. Both the origin of the Kievan state and that of the name Rus, which came to be applied to it, remain matters of debate among historians. According to the traditional account presented in The Russian Primary
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Encyclopedia Britannica
Kievan Rus, first East Slavic state. It reached its peak in the early to mid-11th century.

Both the origin of the Kievan state and that of the name Rus, which came to be applied to it, remain matters of debate among historians. According to the traditional account presented in The Russian Primary Chronicle, it was founded by the Viking Oleg, ruler of Novgorod from about 879. In 882 he seized Smolensk and Kiev, and the latter city, owing to its strategic location on the Dnieper River, became the capital of Kievan Rus. Extending his rule, Oleg united local Slavic and Finnish tribes, defeated the Khazars, and, in 911, arranged trade agreements with Constantinople.

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Oleg’s successor, Igor, is regarded as the founder of the Rurik dynasty, but he was a less-capable ruler than Oleg, and the treaty that he concluded with Constantinople in 945 featured terms that were less favourable than those that had been obtained in 911. In his writings, Byzantine Emperor Constantine VII Porphyrogenitus described trade practices in Kievan Rus at that time. During winter the Kievan princes made circuits among neighbouring tribes to collect tribute, which consisted of furs, money, and slaves. As spring came, they loaded their goods into small boats and moved them down the Dnieper in convoy to discourage attacks by nomadic steppe tribes. Their ultimate destination was Constantinople, where their rights of trading were strictly defined by treaty. Igor’s son Svyatoslav was the last of the Kievan princes to adhere to Scandinavian traditions, and with the ascent of Vladimir I (Volodymyr) in 980, the Rurik line was thoroughly Slavonized. It still preserved its connections with other parts of Europe, however, and it ruled a large territory that stretched from the northern lakes to the steppe and from the then uncertain Polish frontier to the Volga and the Caucasus.

Vladimir’s reign heralded the beginning of the golden age of Kievan Rus, but that era’s brilliance rested on an unsteady base, as the connection between the state and its subject peoples remained loose. The only link unifying the subdued tribes was the power of the grand duke of Kiev. The people paid tribute to the prince’s tax collectors, but they were otherwise left almost entirely to themselves and were thus able to preserve their traditional structures and habits. One development of enormous importance during Vladimir’s reign was his acceptance of the Orthodox Christian faith in 988. The conversion was born of a pact with Byzantine Emperor Basil II, who promised his sister’s hand in marriage in exchange for military aid and the adoption of Christianity by the Kievan state. After traditional religious practices were suppressed in Kiev and Novgorod, the Byzantine rite was propagated throughout Vladimir’s domain. Although the religion came from Constantinople, the service was in the vernacular, as the Bible had been translated into Old Church Slavonic by the missionaries Saints Cyril and Methodius in the 9th century.