Editing 867 (section)

==== Britain ====
*  [[Vikings]] or "[[Danes]]" (the two terms were often used interchangeably at the time), comprising the [[Great Heathen Army]], advance northward from bases in the [[Kingdom of East Anglia]], into the Anglo-Saxon [[Kingdom of Northumbria]].
** [[Deira]], the southernmost part of Northumbria, is conquered by the Vikings. [[Ivar the Boneless]], one of their leaders, installs a [[Puppet monarch|puppet king]] of Northumbria, [[Ecgberht I of Northumbria|Ecgberht I]].<ref>Paul Hill (2009). ''The Viking Wars of Alfred the Great'', p. 30. {{ISBN|978-1-59416-087-5}}.</ref>
** The rival monarchs of Northumbria, [[Ælla of Northumbria|Ælla]] and [[Osberht of Northumbria|Osberht]], join forces in an attempt to expel  the Great Heathen Army, but are [[Battle of York (867)|defeated in battle]] by Ivar the Boneless and [[Halfdan Ragnarsson]]. Osberht is killed in battle, while Ælla is reportedly captured, before being subject to the [[blood eagle]]: a combined method of torture and execution.
** Surviving members of the Northumbrian [[Court (royal)|court]] flee into the northernmost part of the kingdom, [[Bernicia]].