Also to know is, why was Kiev's son called Yaroslav the Wise?
Yaroslav figures prominently in the Norse sagas under the name Jarisleif the Lame; his legendary lameness (probably resulting from an arrow wound) was corroborated by the scientists who examined his remains.
Secondly, why was Kievan Rus important? Among the lasting achievements of Kievan Rus' are the introduction of a Slavic variant of the Eastern Orthodox religion and a synthesis of Byzantine and Slavic cultures. The disintegration of Kievan Rus' played a crucial role in the evolution of the East Slavs into the Russian, Ukrainian, and Belorussian peoples.
Regarding this, was Kiev founded by Vikings?
Vikings founded Kievan Rus in the mid-9th century, but Scandanavian settlements in Eastern Europe actually date back to at least A.D. 750. This is when pre-Viking-Age Scandanavians likely settled the northwestern Russian town of Staraya Ladoga (or “Old Ladoga”), across Lake Ladoga from what is now Finland.
What happened to Kiev when Yaroslav died?
Yaroslav's oldest son became the new ruler. Kiev was divided among Yaroslav's five sons. Kiev was renamed Moscow.