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In page Nizhny Novgorod:

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The city traces its origin from a small Russian wooden hillfort that was founded by grand prince Yuri II of Vladimir in 1221 at the confluence of two of the most important rivers in his principality, the Volga and Oka rivers. It marked the eastern extreme of East Slavic settlement until the end of the medieval period, with Russian expansion eastward delayed until the capture of Kazan in 1552.[citation needed]