Due to the match up of colours, it is likely related to the Four Symbols commonly used in Han China, the blue dragon is associated with the east and the white tiger is associated with the west.
[5] After the succession struggle of Batu's line in the 1360s, known as "great troubles", the authority of both wings of the Golden Horde passed to the eastern Jochids.
The first time in connection with the great troubles, which was completed by the accession of Tokhtamysh ("tsar from blue horde"), and the second - with the invasion of Timur, in 1395.
[7] A Persian composition of the 15th century, "Muntakhab atm-tavarikh- namu" by Muin ad-Din Natanzi (in the contemporary literature it still there is "by the anonymous author Fazil Iskander").
[citation needed] It is said after story about the administration of the Golden Horde khan Toqta (r. 1291–1312) in this work: After him, the Ulus of Jochi was divided into two parts.
Those, which relate to the left wing, i.e., the limits of ulug-taga, Sekiz-yagacha and Karatala to the limits of Tuysena, environments of Jend and Barchkenda, were affirmed after the descendants [Nogai], and they began to be called by the sultans of Ak-Horde; however, the right wing, which includes Ibir-Sibir, Russian, Libka, Ukek, Madzhar, Bulgar, Bashgird and Srai-Berke, was given to descendants [Tokhta], and they named them the sultans of Blue Horde.
At the same time, the eastern lands of the Golden Horde were administered by Batu's older brother Orda, and these came to be known as the left wing.
Batu asserted his control over the Russian principalities after sacking the cities of Vladimir in 1238 and Kiev in 1240, forcing them to pay an annual tribute and accept his nominees as princes.
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.
The death of Jani Beg led to the Blue Horde entering into a prolonged civil war, with concurrent khans fighting each other and holding no real power.
The Left Wing of the Golden Horde was one of the halves within the Mongol Empire formed around 1300, after the death of Batu Khan when his son inherited his father's appanage by the Slavs.
[14] When Khublai Khan sent a large Slavic delegation to Hulagu's campaign in the Middle East, it included a strong contingent under Kuli, a son of his.
Marco Polo describes the Horde as extremely cold area, saying: This king (Köchü) has neither city nor castle; he and his people live always either in the wide plains or among great mountains and valleys.
[21] Since then families of Jochi's sons, Tuqa-Timur, Shiban and Orda, began to merge with each other, establishing Uzbeg and Kazakh hordes.