He would be baptized in the faith of Olga.
But this must be done at the hand of the Greek Patriarch; so he would conquer baptism--and ravish it like booty--not beg for it.

He besieged and took a Greek city.

Then demanded the hand of Anna, sister of the Greek Caesar, threatening in case of refusal to march on Constantinople.

Consent was given upon condition of baptism, which was just what the barbarian wanted.

So he came back to Kief a Christian, bringing with him his new Greek wife, and his new baptismal name of Basil.
Amid the tears and fright of the people, the idols were torn down; Perun was flogged and thrown into the Dnieper.