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.
Ine of Wessex Ine was King of Wessex from 688 to 726. He was unable to retain the territorial gains of his predecessor, Cædwalla, who had brought much of southern England under his control and expanded West Saxon territory substantially. By the end of Ine's reign, the kingdoms of Kent, Sussex, and Essex were no longer under West Saxon domination; however, Ine maintained control of what is now Hampshire, and consolidated and extended Wessex's territory in the western peninsula.