Who was perhaps not the only king of the West Saxons at the time, whos viceroy is said to have constructed Chisbury Camp, and to have founded Abingdon Abbey?
Cissa (West Saxon) Cissa was reported as the viceroy of king Centwine of Wessex (reigned c.676-686). Cissa is sometimes said to have himself been a king of Wessex, but does not feature in the king lists or genealogies. He is said to have constructed Chisbury Camp, and to have founded Abingdon Abbey.
Ealdwulf of East Anglia Ealdwulf (or Aldwulf) was king of East Anglia from 663 to around 713. His forty-nine year reign was extraordinary in length, with only Æthelbald of Mercia and Offa of Mercia having comparable longevity. Little is known of Ealdwulf, but his long rule reflects the success of alliances formed in the decades before his ascension. During his reign, East Anglia experienced a long period of stability and growth, not least in its commercial centre at Gipeswic (now modern Ipswich).