Æthelbald, King of Wessex in the context of "Æthelwulf"

Alfred the Great (Old English: Ælfrǣd [ˈæɫvˌræːd]; c. 849 – 26 October 899) was King of the West Saxons from 871 to 886, and King of the Anglo-Saxons from 886 until his death in 899. He was the youngest son of King Æthelwulf and Æthelwulf's first wife Osburh, who both died when Alfred was young. Three of Alfred's brothers, Æthelbald, Æthelberht and Æthelred, reigned in turn before him. Under Alfred's rule, considerable administrative and military reforms were introduced, prompting lasting change in England.

After ascending the throne, Alfred spent several years fighting Viking invasions. He won a decisive victory in the Battle of Edington in 878 and made an agreement with the Vikings, dividing England between Anglo-Saxon territory and the Viking-ruled Danelaw, which consisted of Scandinavian York, the north-east Midlands, and East Anglia. Alfred also oversaw the conversion of Viking leader Guthrum to Christianity. He defended his kingdom against the Viking attempt at conquest, becoming the dominant ruler in England. Alfred began styling himself as "King of the Anglo-Saxons" after reoccupying London from the Vikings. Details of his life are described in a work by 9th-century Welsh scholar and bishop Asser.

Æthelberht (Old English: [ˈæðelberˠxt]; also spelled Ethelbert or Aethelberht) was the King of Wessex from 860 until his death in 865. He was the third son of King Æthelwulf by his first wife, Osburh. Æthelberht was first recorded as a witness to a charter in 854. The following year Æthelwulf went on pilgrimage to Rome and appointed his oldest surviving son, Æthelbald, as king of Wessex while Æthelberht became king of the recently conquered territory of Kent. Æthelberht may have surrendered his position to his father when he returned from pilgrimage but resumed (or kept) the south-eastern kingship when his father died in 858.

When Æthelbald died in 860, Æthelberht united both their territories under his rule. He did not appoint a sub-king and Wessex and Kent were fully united for the first time. He appears to have been on good terms with his younger brothers, the future kings Æthelred I and Alfred the Great. The kingdom came under attack from Viking raids during his reign, but these were minor compared with the invasions after his death. Æthelberht died in the autumn of 865 and was buried next to his brother Æthelbald at Sherborne Abbey in Dorset. He was succeeded by Æthelred.

Judith of Flanders (c. 843 – 870 or later) was a Carolingian princess who became Queen of Wessex by two successive marriages and later Countess of Flanders. Judith was the eldest child of the Carolingian emperor Charles the Bald and his first wife, Ermentrude of Orléans. In 856, she married Æthelwulf, King of Wessex. After her husband's death in 858, Judith married his son and successor, Æthelbald. King Ætheldbald died in 860. Both of Judith's first two marriages were childless. Her third marriage was to Baldwin I, Margrave of Flanders, with whom she had several children.