At the end of the first Millennium - AD 988.
Vladimir I ordered his subjects to convert to Orthodox Christianity.
AnswerIn the late tenth century, Vladimir, the prince of Kiev, adopted Byzantine Christianity and ordered the mass baptism of Russians.
Trying to convert them into Christianity
to convert many people to Christianity
Vladimir
The Slavs, eg. the Russians and Serbians.
Christianity.
No.
Constantine
Absolutely not.
In the summer of 386 Augustine converted to Christianity.
Vladimir the Great