Editing 829 (section)

=== By place ===

==== Byzantine Empire ====
* [[October 2]] &ndash; Emperor [[Michael II]] dies after an 8-year reign in [[Constantinople]], and is succeeded by his 16-year-old son [[Theophilos (emperor)|Theophilos]], as sole emperor of the [[Byzantine Empire]]. He continues his father's ideology of [[Byzantine Iconoclasm|iconoclasm]].<ref name="Gregory227">Timothy E. Gregory, ''A History of Byzantium'', (Blackwell Publishing Ltd, 2010), p. 227.</ref>
* [[October]] &ndash; [[Battle of Thasos]]: [[Saracen]]s from the newly founded [[Emirate of Crete]] almost annihilate the [[Byzantine navy|Byzantine fleet]] at [[Thasos]], close to the coast of [[Thrace]]. The [[Cyclades]] and other islands in the [[Aegean Sea]] are pillaged.<ref>Treadgold, Warren (1988). The Byzantine Revival, 780–842, Stanford University Press, p. 268. {{ISBN|0-8047-1462-2}}.</ref>

==== Europe ====
* Emperor [[Louis the Pious]] appoints his 6-year-old son [[Charles the Bald|Charles]] (by his second wife [[Judith of Bavaria (died 843)|Judith]]) as ruler of the Frankish subkingdom [[Alamannia]], enraging his eldest son and co-emperor [[Lothair I]], who begins an insurrection. 
* [[Vikings|Viking]] chieftain [[Halfdan the Black]] becomes king of [[Agder]] (modern [[Norway]]). He expands his realm through military conquest and political negotiations, dividing the kingdom of [[Vestfold]] with his half-brother [[Olaf Geirstad-Alf|Olaf]].
* [[Giustiniano Participazio]], doge of [[Republic of Venice|Venice]], dies after a 2-year reign, and is succeeded by his younger brother [[Giovanni I Participazio|Giovanni Participazio]]. He continues the work of Giustiniano, in construction of [[St Mark's Basilica|St. Mark's Basilica]].

==== Britain ====
* King [[Egbert of Wessex]] invades [[Mercia]], ousts his rival [[Wiglaf of Mercia|Wiglaf]], and attempts to rule directly from [[Wessex]]. He is recognized as overlord (''[[bretwalda]]'') of other [[Anglo-Saxon kingdoms|English kingdom]]s. 
* Winter &ndash; Battle of the River Dore: Egbert of Wessex leads his army against the [[Kingdom of Northumbria|Northumbria]]ns as far as [[Dore, South Yorkshire|Dore]], where he clashes with King [[Eanred of Northumbria]].

==== Egypt ====
* The [[Nile|Nile River]] freezes over.<ref>Lamb, H. H. (1977) ''Climate: Present, Past and Future: Climatic History and the Future'' Vol 2, Methuen and Co. Ltd., London.</ref>

==== China ====
* The [[Bai people|Bai]] [[kingdom of Nanzhao]] captures the city of [[Chengdu]], in [[Sichuan]] Province.