Who ruled
- Tang Emperor Wuzong of Tang 840–846
- unattached Ögä Khan 840–846
And beyond the steppe
- China Tang Wuzong 840–846
- Iran Abbasid al-Wathiq 842–847
- Korea Silla Later Silla 780–930
- Byzantium Amorian Michael III 842–867
Eastern steppe
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Environment · Central Mongolia turns drier, by the lake record, and stays so to 1300; the droughts of the Medieval Climate Anomaly (700–1300)
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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
China
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February · Tang troops break the camp of the Uyghur khan Ögä at Shahu Mountain and recover the princess Taihe, whom the Kirghiz had taken in 840
Rescue of Princess Taihe (840–843) · Princess Taihe · Shi Xiong · Ögä Khan
The princess enters Chang'an on 29 March 843
