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Years · 9th century

840

Year of the monkey biçin yıl

3 entries in Eastern steppe.

Map of Asia in 840: the Kirghiz destroy Ordu-Baliq, and the Uyghurs flee to the Tang frontier, to Gansu, to the Tarim and to the Karluks; the steppe is left empty — 840: The Kirghiz destroy the Uyghur Khaganate and burn Ordu-Baliq. The Uyghurs scatter to the Tang frontier, to Gansu, to the Tarim and to the Karluks. Modern map; the roads of the flight are drawn, not recorded.

Who ruled

Tang Emperor Wuzong of Tang 840–846
unattached Ögä Khan 840–846
Uyghur Khaganate Hesa Khan 839–840

And beyond the steppe

China Tang Wenzong 827–840 · Wuzong 840–846
Iran Abbasid al-Mu'tasim 833–842
Korea Silla Later Silla 780–930
Byzantium Amorian Theophilos 829–842

Eastern steppe

Environment · Central Mongolia turns drier, by the lake record, and stays so to 1300; the droughts of the Medieval Climate Anomaly (700–1300)

Climate and the steppe empires · Orkhon valley
Environment · Persistent drought in the Orkhon country through the last Uyghur decades, by the tree rings (783–850)

Climate and the steppe empires · Uyghur Khaganate

From the tree-ring record of the Uyghur period
The Kirghiz destroy the Uyghur Khaganate

Yenisei Kirghiz · Uyghur Khaganate · Ordu-Balık · The fall of Ordu-Balık, 840