Editing 878 (section)

==== Britain ====
* [[January 6]] &ndash; [[Battle of Chippenham]]: King [[Alfred the Great]] of Wessex is surprised by a [[Viking]] attack at [[Chippenham]] in Wiltshire. He is forced to flee, with his retinue, into the [[Somerset Levels]] for safety. From his headquarters at [[Athelney]], Alfred wages [[guerrilla warfare]] against the Vikings.
* [[May]] &ndash; [[Battle of Edington]]: Supported by all the levies of [[Somerset]], [[Wiltshire]] and [[Hampshire]], Alfred the Great decisively defeats the main body of Danish Vikings, led by King [[Guthrum]], at modern-day [[Edington, Wiltshire]] (near [[Bratton Castle]]).
* [[Treaty of Wedmore]]: Guthrum agrees to a [[peace treaty]] and is [[Baptism|baptised]], taking the name of Aethelstan. [[England]] is divided between [[Wessex]] in the south, and the Vikings in the [[Danelaw]] up north. Guthrum returns to [[Kingdom of East Anglia|East Anglia]].
* [[Battle of Cynwit]]: Viking raiders, led by [[Ubba|Ubba Ragnarsson]], land on the coast at [[Combwich]] with 23 ships, and besiege a hillfort (called Cynwit) at [[Cannington, Somerset]]. Ealdorman [[Odda, Ealdorman of Devon|Odda]] launches a surprise attack, and kills Ubba in battle.<ref>Paul Hill (2009). ''The Viking Wars of Alfred the Great'', pp. 73–76. {{ISBN|978-1-59416-087-5}}.</ref>
* King [[Rhodri the Great]] of [[Kingdom of Gwynedd|Gwynedd]], [[Kingdom of Powys|Powys]] and [[Seisyllwg]], returns to his kingdoms, but is killed fighting the Mercians of King [[Ceolwulf II of Mercia|Ceolwulf II]]. His kingdoms are divided amongst his three sons: [[Anarawd ap Rhodri|Anarawd]], [[Merfyn ap Rhodri|Merfyn]] and [[Cadell ap Rhodri|Cadell]]. 
* King [[Áed mac Cináeda]] of [[Kingdom of Scotland|Scotland]] is killed in battle, by his rival [[Giric|Giric mac Dúngal]]. Giric becomes [[List of kings of the Picts|king of the Picts]], and allies himself with [[Eochaid, son of Rhun|Eochaid]] (grandson of [[Kenneth MacAlpin|Kenneth I]]). The two rule all of [[Alba]] (Scotland) together as joint-kings.