Ecgberht, King of Wessex in the context of "House of Wessex"

Æthelwulf (Old English: [ˈæðelwuɫf]; Old English for "Noble Wolf"; died 13 January 858) was King of Wessex from 839 to 858. In 825, his father, King Ecgberht, defeated King Beornwulf of Mercia, ending a long Mercian dominance over Anglo-Saxon England south of the Humber. Ecgberht sent Æthelwulf with an army to Kent, where he expelled the Mercian sub-king and was himself appointed sub-king. After 830, Ecgberht 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.

The Vikings were not a major threat to Wessex during Æthelwulf's reign. In 843, he was defeated in a battle against the Vikings at Carhampton in Somerset, but he achieved a major victory at the Battle of Aclea in 851. In 853, he joined a successful Mercian expedition to Wales to restore the traditional Mercian hegemony, and in the same year, his daughter Æthelswith married King Burgred of Mercia. In 855, Æthelwulf went on a pilgrimage to Rome. In preparation he gave a "decimation", donating a tenth of his personal property to his subjects; he appointed his eldest surviving son Æthelbald to act as King of Wessex in his absence, and his next son Æthelberht to rule Kent and the south-east. Æthelwulf spent a year in Rome, and on his way back he married Judith, the daughter of the West Frankish king Charles the Bald.

Æthelstan (/ˈæθəlstæn/; died c. 852) was the King of Kent from 839 to 851. He served under the authority and overlordship of his father, King Æthelwulf of Wessex, who appointed him. The late D, E and F versions of the Anglo-Saxon Chronicle describe Æthelstan as Æthelwulf's brother, but the A, B and C versions, and Æthelweard's Chronicon, state that he was Æthelwulf's son. Some historians have argued that it is more probable that he was a brother, including Eric John in 1966 and Ann Williams in 1978. However, in 1991 Ann Williams described him as Æthelwulf's son, and this is now generally accepted by historians, including Frank Stenton, Barbara Yorke, and D. P. Kirby.

When Æthelwulf became King of the West Saxons in 839 on the death of his father, Ecgberht, he appointed Æthelstan to rule over Kent, Essex, Surrey and Sussex. He is styled king in the Anglo-Saxon Chronicle and Æthelweard's chronicle calls him "King of the Dwellers in Kent, of the East Saxons, of the South Saxons and of Surrey". He attested a number of his father's charters as king in the 840s.

The Kingdom of the East Saxons (Old English: Ēastseaxna rīce; Latin: Regnum Orientalium Saxonum), referred to as the Kingdom of Essex /ˈɛsɪks/, was one of the seven traditional kingdoms of the Anglo-Saxon Heptarchy. It was founded in the 6th century and covered the territory later occupied by the counties of Essex, Middlesex, much of Hertfordshire and (for a short while) west Kent. The last king of Essex was Sigered of Essex, who in 825 ceded the kingdom to Ecgberht, King of Wessex.
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The Battle of Ellendun or Battle of Wroughton was fought between Ecgberht of Wessex and Beornwulf of Mercia in September 825. Sir Frank Stenton described it as "one of the most decisive battles of English history". It effectively established West Saxon dominance in southern England.

Cædwalla (/ˈkædˌwɔːlə/; c. 659 – 20 April 689) was the King of Wessex from approximately 685 until he abdicated in 688. His name is derived from the Welsh Cadwallon. He was exiled from Wessex as a youth and during this period gathered forces and attacked the South Saxons, killing their king, Æthelwealh, in what is now Sussex. Cædwalla was unable to hold the South Saxon territory, however, and was driven out by Æthelwealh's ealdormen. In either 685 or 686, he became King of Wessex. He may have been involved in suppressing rival dynasties at this time, as an early source records that Wessex was ruled by underkings until Cædwalla.

After his accession, Cædwalla returned to Sussex and won the territory again. He also conquered the Isle of Wight, gained control of Surrey and the kingdom of Kent, and in 686 he installed his brother Mul as king of Kent. Mul was burned in a Kentish revolt a year later, and Cædwalla returned, possibly ruling Kent directly for a period.

Ealhmund was King of Kent in 784. He was probably the father of King Ecgberht who was King of Wessex from 802, and who conquered Kent in the 820s. Ecgberht was the grandfather of King Alfred the Great.