Elfward

Elfward, (c. 903 - 2 August 924) son (possibly illegitimate) of Edward the Elder is sometimes said to have reigned for a short time after his father's death. The Anglo-Saxon Chronicles says only:

Elfward
King of Wessex
In office July 17, 924 – August 2, 924
Preceded by	Edward the Elder
Succeeded by	Athelstan
Born	c. 903 Wessex
Died	August 2, 924 Oxford

”King Edward passed away, in Mercia, at Farndon, and his son Ælfweard very soon after – sixteen days – at Oxford, their bodies lie at Winchester, Æthelstan was chosen king...”

Reference:"The Anglo-Saxon Chronicles" as stated above.