Religion, especially Orthodox Christianity played an important role in uniting the people known as Kievan Rus under King Vladimir.
Kievan Rus is used to refer to a loose federation of East Slavic, Baltic and Finnic peoples. Before King Vladimir brought Christianity to this East Slavic area, the Kievan Rus practiced traditional Baltic, Slavic, and Finnish religions.
In order to strike auspicious military and economic alliance with the Byzantine people, King Vladimir decided to embrace and introduce Christianity, inviting his people to be baptized as Christians.
Thus, we can conclude that Orthodox Christianity played a pivotal role in uniting the Kievan Rus with the Slavic, Baltic, and Finnic peoples of the region.
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