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.
Frithuwold of Chertsey Frithuwald was a seventh-century Anglo-Saxon ruler in Surrey, and perhaps also in modern Berkshire and Buckinghamshire, who is known from two surviving charters. He was a sub-king ruling under King Wulfhere of Mercia. According to late hagiographical materials, he was a brother-in-law of Wulfhere. The monks of Saint Peter's Minster, Chertsey, revered Frithuwald, whom they considered the founder of their monastery, as a saint.