Map Reference: C853306 (2853, 4306)
This large oval mound dominates the river and must have been of great strategic importance. However its exact date remains something of a puzzle. It is known that there was a major Mesolithic occupation site beside the mound. It is thought that it may have been an Early Christian promontory fort but none of the excavation finds support this theory. It may have been an Anglo-Norman motte which was modified for artillery warfare in the 17th century. A large amount of the mound, particularly on the side closer to the river, has been removed. Whether this is general quarrying or 17th century modifications is not clear. There is a good ditch on the landward side of the mound.
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