Upper Oka Principalities

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In Russian historiography, the Upper Oka Principalities, also known as the Upper Principalities or the Principalities of the Upper Reaches, were a number of small Russian principalities situated along the upper reaches of the Oka River around the turn of the 14th and 15th centuries.

Excerpt from the Wikipedia article “Upper Oka Principalities”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Aleksey Maksimov, Public domain, via Wikimedia Commons.