When the power of the Golden Horde began to diminish, the local Mişär Tatar Murzas from Piana and Temnikov tried to rule the Chuvash area.
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The Battle on Pyana River took place on August 2, 1377 between the Blue Horde Khan Arapsha (Arab-Shah Muzaffar) and joint Russian troops under Knyaz Ivan Dmitriyevich, made up of the Pereyaslavl, Yaroslavl, Yuryev, Nizhny Novgorod and Murom warlords.