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
Danelaw from King Edmund of East Anglia. 870 − King Edmund refused, Ivar the Boneless defeated and captured him at Hoxne, adding East Anglia to the area controlled by the invading Danes. King Æthelred and Alfred attacked the Danes at Reading, but were repulsed with heavy losses. The Danes pursued them. 871 − On 7 January, they made their stand at Ashdown (on what is the Berkshire/North Wessex Downs now in Oxfordshire). Æthelred could not be found at the start of battle, as he was busy praying in his tent, so Alfred led the army into battle. Æthelred and Alfred defeated