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
Bagsecg Bagsecg Bagsecg (died 8 January 871), also known as Bacgsecg, was a ninth-century Viking, and one of the first to be recorded by the "Anglo-Saxon Chronicle". Both he and Healfdene were the two commanding Viking kings of the Great Army that set up camp at Reading, and invaded the Kingdom of Wessex in the winter of 870/871. The Great Army is recorded to have combated the West Saxons in several engagements in 871. One of these was the Battle of Ashdown, in which Bagsecg and five Viking earls were slain against the forces Æthelred, King of Wessex. After Bagsecg's death,