Question: Name the King of Wessex from 839 to 858 whose father, King Egbert, defeated Beornwulf of Mercia and who himself led the Battle of Aclea between the West Saxons and the Danish Vikings?
Sentence (from "Cynegils"): This region, probably connected to the early tribal grouping known as the Gewisse, a term used by Bede for the West Saxons, lay on the frontier between the later kingdoms of Wessex and Mercia.
Relevant evidence: No