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Upper Oka Principalities
The Upper Principalities (Russian: ВерховŃкие княжеŃтва) is a term traditionally applied in Russian historiography to about dozen tiny and ephemeral polities situated along the upper course of the Oka River at the turn of the 14th and 15th centuries. Nowadays, the areas so designated lie within the bounds of the Tula Oblast and Kaluga Oblast of Russia.
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