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. == History == They were formed between the 13th and 15th centuries as a result of the fragmentation of the Principality of Chernigov.
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. == History == They were formed between the 13th and 15th centuries as a result of the fragmentation of the Principality of Chernigov.
Source: Wikipedia "Upper Oka Principalities" · CC BY-SA 4.0
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