Battle of Pliska
Khan Krum annihilates Emperor Nikephoros's army
Emperor Nikephoros I sacked the Bulgar capital Pliska, but on the way back, on 26 July 811, Khan Krum trapped his army in a mountain pass and destroyed it. Nikephoros was killed, the first emperor to fall in battle since Valens in 378; legend says Krum made his skull into a cup.
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Meanwhile around the world (±25 years)
Asia
- 802 Founding of the Khmer Empire — 9 years earlier
Americas
- c. 800–950 Drought and the Classic Maya collapse — 11 years earlier
Alive at the time
- Charlemagne (aged 63)
- Louis the Pious (aged 33)
- Al-Khwarizmi (aged 31)
- Adi Shankara (aged 23)
- Al-Kindi (aged 10)