Answer:
False
Explanation:
The Early Grand Princes of Kev did not become Roman Catholics. One of the Early Grand Princes of Kev known as Vladimir Sviatoslavich ( Vladimir the great ) was the first Prince to be become a Christian.
He was an Orthodox Christian i.e and Orthodox Catholic and not a Roman Catholic. He practised Byzantine Christianity.
As an Orthodox Christian or Catholic, they spoke Greek and the Priests were allowed to get married.