+The year 1223 marked a pivotal clash between Rus' principalities and Mongol forces at the [Kalka River](/wiki/Kalka_River). Across [Europe](/wiki/Europe), new reigns began, shaping the unfolding [Thirteenth Century](/wiki/Thirteenth_Century).
+## See also
+- [Mongol Empire](/wiki/Mongol_Empire)
+- [Kievan Rus'](/wiki/Kievan_Rus')
+- [Middle Ages](/wiki/Middle_Ages)
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