Battle of the Conwy In 877 they partitioned Mercia, taking the east for themselves and leaving the west to Ceolwulf. Gwynedd was also under attack from the Vikings, and in 877 King Rhodri Mawr was defeated and driven out. He returned the following year, but immediately came under attack from Mercia, which was still trying to maintain its hegemony in Wales. King Alfred's victory over the Vikings at the Battle of Edington in May 878 relieved the pressure on Mercia, and in the same year Mercia defeated and killed Rhodri Mawr. Ceolwulf died or was deposed in 879, and he was succeeded as Lord
Battle of Basing Battle of Basing The Battle of Basing was a battle on 22 January 871 at Old Basing in what is now the English county of Hampshire. It was one of a series of battles that took place following an invasion of the then kingdom of Wessex by an army of Danes. Both battle and campaign are described in the "Anglo-Saxon Chronicle". The Danes had established a camp at Reading, and the previous battles of Englefield, Reading and Ashdown had proved indecisive, with victories to both sides. Two weeks after the Saxon victory at Ashdown, the armies met again at Basing.