From where is, went and took the name "Kyivskaya Rus":

At a time when the Russian historical science periodized the past of Russia, Russian historian Sergey Soloviev (1820-1879) divided the past of Russia into several stages. He divided it, based on the location of the capital of the State. Rus of Kiev, Rus of Vladimir, Rus of Moscow, Russia of St. Petersburg. This is where the education "Kyivskaya Rus" came from. Although we will emphasize that this is a conditional name, introduced by historians, and it never existed in our past reality.

Here is so.