Andhun was an Ealdorman

Ealdorman

An ealdorman is the term used for a high-ranking royal official and prior magistrate of an Anglo-Saxon shire or group of shires from about the ninth century to the time of King Cnut...

 of Sussex

Kingdom of Sussex

The Kingdom of Sussex or Kingdom of the South Saxons was a Saxon colony and later independent kingdom of the Saxons, on the south coast of England. Its boundaries coincided in general with those of the earlier kingdom of the Regnenses and the later county of Sussex. A large part of its territory...

 under King Æðelwealh

Aethelwalh of Sussex

Æthelwealh was the first historical king of Sussex. Æthelwealh became the first Christian king of Sussex and was king when Sussex was converted to Christianity in 681...

, who was slain by the Wessex

Wessex

The Kingdom of Wessex or Kingdom of the West Saxons was an Anglo-Saxon kingdom of the West Saxons, in South West England, from the 6th century, until the emergence of a united English state in the 10th century, under the Wessex dynasty. It was to be an earldom after Canute the Great's conquest...

 prince Cædwalla, who invaded and ravaged Sussex. Berhthun

Berthun of Sussex

Beorhthun was a dux of the South Saxons.Bede's Historia ecclesiastica gentis Anglorum records the invasion of the South Saxon kingdom by Caedwalla of the West Saxons and the killing of the South Saxon king Æthelwalh. Caedwalla was driven off by Beorhthun and Andhun who then jointly ruled the...

 and Andhun succeeded in driving Caedwalla from the Kingdom.

In 686 the South Saxons attacked Hlothhere, King of Kent

Kingdom of Kent

The Kingdom of Kent was a Jutish colony and later independent kingdom in what is now south east England. It was founded at an unknown date in the 5th century by Jutes, members of a Germanic people from continental Europe, some of whom settled in Britain after the withdrawal of the Romans...

, in support of his nephew Eadric

Eadric of Kent

Eadric was a King of Kent . He was the son of Ecgberht I.Eadric was for a time co-ruler alongside his uncle Hlothhere, and a code of laws issued in both their names has survived. However, Eadric eventually revolted and defeated Hlothhere with the aid of the South Saxons...

, but soon after Berhthun was killed and the kingdom subjugated for a time by Ceadwalla, who had now become King of Wessex.