1911 Encyclopædia Britannica/Æthelbald (king of Wessex)
ÆTHELBALD, king of Wessex, was the son of Æthelwulf, with whom he led the West Saxons to victory against the Danes at Aclea, 851. According to Asser he rebelled against his father on the latter’s return from Rome in 856, and deprived him of Wessex, which he ruled until his death in 860. On his father’s death in 818 he married his widow, Judith.
See Asser, Life of Alfred (W. H. Stevenson, 1904), 12; Saxon Chronicle, s.a. 851, 855, 860.