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He left the Kievan state to spread it among his sons. This ended up causng a power struggle whihc split the empire up.
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Prince Ivan I of Moscow earned the gratitude of the Moscows by helping to crush the Russian revolt against Mongol rule. In return, Ivan was appointed tax collector of the slavic lands.
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After converting Constantinople to Christianity, she ruled from 945-964 until her son was old enough to rule.