This man's most enduring work was the legal reforms codified in his Book of Dooms, which eventually grew into English Common Law, and the Anglo-Saxon Chronicle began under his reign.
Asser's record of this man's life is a fine source, thought he ruled for six more years after its publication. This king's defeated his people's great rivals in the Battle of Eddington of 878, after which their king Guthrum converted to Christianity and settled in East Anglia. This man's most enduring work was the legal reforms codified in his Book of Dooms, which eventually grew into English Common Law, and the Anglo-Saxon Chronicle began under his reign. For ten points, name this ruler notable for his scholarship and for defeating the Danes as the king of Wessex, which lead to his being given the epithet "the Great."
Asser's record of this man's life is a fine source, thought he ruled for six more years after its publication.
{Alfred} the Great of Wessex