Plan of the castle
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FitzHarris Castle was built near Abingdon between 1071 and 1084 in the aftermath of the Norman invasion of England by a probable Norman knight called Owen. The castle formed a motte, 78 ft by 68 ft across, protected by a stream that flowed around the motte to produce a moat. In due course the castle was supplemented by the nearby manor house called FitzHarry's, but a keep remained on the motte as late as 1247, probably for defensive purposes.
- Preston, A. E. (1934) "A Moated Mound at Abingdon, Berks," The Berkshire Archaeological Journal 38, pp. 167–170.