○○○ 0988 ⪢⪢
In exchange, Vladimir asks for the hand of the emperor's sister. But to get married, he first has to break with paganism and convert to
Christianity.
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http://qindex.info/i.php?x=11854
○○○ 0989 ⪢⪢
After his baptism and wedding,
Christianity of the Byzantine Rite becomes the official religion of the Kievan Rus', under the authority of the Patriarch of Constantinople.
http://qindex.info/i.php?x=11856
○○○ 1054 ⪢⪢
In 1054, after tensions between Rome and Constantinople,
Christianity is split between the Orthodox and Catholic Churches. This further widens the gap between the Slaves of the Kievan Rus' and the Polish Slaves who had converted to Catholicism.
http://qindex.info/i.php?x=11896