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.
Ælfric of Eynsham Ælfric of Eynsham (Old English: "Ælfrīc" ; Latin: "Alfricus", "Elphricus" ) (  955 – c. 1010 ) was an English abbot, as well as a consummate, prolific writer in Old English of hagiography, homilies, biblical commentaries, and other genres. He is also known variously as "Ælfric the Grammarian" ("Alfricus Grammaticus"), "Ælfric of Cerne", and "Ælfric the Homilist". In the view of Peter Hunter Blair, he was "a man comparable both in the quantity of his writings and in the quality of his mind even with Bede himself." According to Claudio Leonardi, he "represented the highest pinnacle of Benedictine reform and Anglo-Saxon literature".