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.
 1054 ⪢⪢
Yaroslav, who has many sons, fears a new fratricidal war after his death. He then decides to divide the Kievan Rus' into several principalities that he shares between his sons in whom he has the most confidence.
 1054 ⪢⪢
The eldest son gets the most important title of Grand Prince of Kiev. After his death, the cadet will take his place and the princes will change thrones.
 1054 ⪢⪢
This new rotating power-sharing agreement will be the root cause for several generations' numerous internal wars that will exhaust and divide the Kievan Rus'. #will_would
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