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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.
According to the Tarikh-i Dost Sultan written by Ötemish Hajji in Khiva in the 1550s, Batu's ulus was officially known as the "White Horde", Orda's the "Blue Horde" and Shiban's the "Grey Horde".
Batu Khan effectively founded the White Horde (or Blue Horde) upon the withdrawal from Europe in 1242 and by 1245, Sarai, the capital of the Horde had been founded on the lower Volga.
In 1375, Urus Khan, the eighth khan of the Left wing, became a contested khan of both the Blue Horde and the White Horde.
In Russian chronicles, the Blue Horde is described as the eastern part of the Golden Horde, which was being found in the allegiance on west, and which was being governed by the descendants of Orda Khan.
Nogai's pre-eminence was ended by the assertion of the legitimate Khan Toqta, and the Blue Horde reached the apex of its power and prosperity during the reigns of Uzbeg Khan (Öz Beg) and his son Jani Beg in the middle of the 14th century, when it intervened in the affairs of the disintegrating Ilkhanate.
From the 1280s until 1299, the White Horde (or Blue Horde) was effectively under the control of two khans, the legitimate khans and Nogai Khan, a warlord and kingmaker, who made an alliance with the Byzantine Empire and invaded countries bordering the Blue Horde, particularly in the Balkans.