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?
Æthelwulf Æthelwulf (Old English for "Noble Wolf"; died 13 January 858) was King of Wessex from 839 to 858. In 825, his father, King Egbert, defeated King Beornwulf of Mercia, ending a long Mercian dominance over Anglo-Saxon England south of the Humber. Egbert sent Æthelwulf with an army to Kent, where he expelled the Mercian sub-king and was himself appointed sub-king. After 830, Egbert maintained good relations with Mercia, and this was continued by Æthelwulf when he became king in 839, the first son to succeed his father as West Saxon king since 641.
Thorstein the Red Thorstein the Red or Thorstein Olafsson was a viking chieftain who flourished in late ninth-century Scotland. He was born around 850 AD and was the son of Olaf the White, King of Dublin, and Aud the Deep-minded, who was the daughter of Ketil Flatnose. After the death of Olaf, Aud and Thorstein went to live in the Hebrides, then under Ketil's rule.