Baptism of Kiev
The Christianization of Kievan Rus' took place in several stages. In early 867, Patriarch Photius of Constantinople announced to other Orthodox patriarchs that the Rus', baptised by his bishop, took t...
Baptism of Kiev - Wikipedia
Christianization of the Rus' Khaganate
The Christianization of the Rus' people is supposed to have happened in the 860s and was the first stage in the process of Christianization of the East Slavs which continued well into the 11th century...
Christianization of the Rus' Khaganate - Wikipedia