Æthelred, Lord of the Mercians

Æthelred became Lord of the Mercians in England shortly after the death or disappearance of Mercia's last king, Ceolwulf II, in 879. He is also sometimes called the Ealdorman of Mercia. Æthelred's rule was confined to the western half, as eastern Mercia was then part of the Viking-ruled Danelaw. His ancestry is unknown. He was probably the leader of an unsuccessful Mercian invasion of Wales in 881, and soon afterwards he acknowledged the lordship of King Alfred the Great of Wessex. This alliance was cemented by the marriage of Æthelred to Alfred's daughter Æthelflæd.