- 820
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Events
By Place
Asia
*
Tahir , the son of a slave, is rewarded with the governorship ofKhurasan for supporting thecaliphate . He rules independently ofBaghdad , not even mentioning the caliph's name in Friday prayers in recognition of caliphal authority.Byzantine Empire
*
Michael II succeeds Leo V as Byzantine Emperor.Europe
* The "
Historia Brittonum " is written (approximate date).
*Feidlimid mac Cremthanin assumes the kingship ofMunster .By Topic
cience & Technology
*
Muslim mathematicianMuḥammad ibn Mūsā al-Ḵwārizmī foundsalgebra .Births
* Rhodri "Mawr" ('the Great'), ruler of Gwynedd (
Wales ) (approximate date) (d.878 )
* Photius I,Patriarch of Constantinople (approximate date) (d.891 )Deaths
*
December 24 — Leo V (45),Byzantine Emperor (b.775 ) (assassinated)
* Tang Xian Zong (42),emperor of China (b.778 )
*Adi Shankara (32), Hindu sage (n.788 ).
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