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-Mu'tasim 833–842 · al-Wathiq 842–847
- Korea Silla Later Silla 780–930
- Byzantium Amorian Theophilos 829–842 · 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
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The first of four Kirghiz envoys reaches the Tang frontier; the exchange of letters and titles runs to 848
Kirghiz Embassies to the Tang (842–848) · Yenisei Kirghiz Khaganate · Are Khan · The Kirghiz descent from Li Ling
Tibet
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The Tibetan empire comes apart in a succession quarrel, two years after the Kirghiz destroy the Uyghurs; inner Asia is left without a great power
