page_title: List of Anglo-Welsh wars
section_title: Ninth Century
hierarchical_section_title: List of Anglo-Welsh wars / Ninth Century
context_page_description: This is an incomplete list of the wars and battles between the Anglo-Saxons who later formed into the Kingdom of England and the Britons, as well as the conflicts between the English and Welsh in subsequent centuries. The list begins after the Adventus Saxonum in c. AD 446 to the late Middle Ages when Wales was eventually subdued and annexed by England. The list is not exhaustive but seeks to note the significant campaigns and the major battles.
context_section_description: During the first half of the century a reinvigorated Mercia almost conquers the rest of Wales. At the end of the century Viking raids on England bring the Welsh some respite.
  815 where Egbert of Wessex invades Cornwall and subdues the kingdom. 820 has also been suggested as a possible date for this "invasion"
  816 Mercians invade Powys.
  822 where Coelwulf of Mercia invades north Wales and captures Deganwy from Gwynedd and occupies the whole of Powys.
  825 Battle of Camelford between Wessex and the Cornish Welsh resulting in another West Saxon victory.
  828 the lands of Powys are liberated from Mercian occupation by Cyngen ap Cadell. The Pillar of Eliseg was probably commissioned at this time.
  830 where Egbert of Wessex invades Powys and forces Cyngen ap Cadell to submit. Egbert then withdraws his forces.
  838 Battle of Hingston Down in Cornwall where a combined force of Cornish and Danes were defeated by Wessex.
  853 where Burgred of Mercia overruns Powys. Cyngan ap Cadell abdicates and retires to Rome and his kingdom is annexed by Rhodri Mawr of Gwynedd.
  865 where Burgred of Mercia leads his forces against Rhodri Mawr and captures Anglesey, briefly, from Gwynedd. Burgred is later forced to withdraw as his realm is invaded by the Vikings.
  878 the Welsh of Strathclyde in alliance with Kenneth MacAlpin invade northern Northumbria, currently at war with the Vikings, and liberate the Lothian region.
  890 at least some of the "men of Strathclyde" are forced to relocate to Gwynedd after their kingdom, much weakened by the Vikings, is overrun by Angles and Scots.
caption: Map of the extent of Hywel Dda's power   Deheubarth, Hywel Dda's principality  Combine to form Morgannwg