Oxford Castle Motte
Oxford Castle was founded in 1071, not long after the Norman invasion of 1066. The original fortification may have been constructed of wood and later replaced with a stone tower. Excavations beneath the motte and in surrounding areas have uncovered evidence of pre-Norman (Saxon) habitation. The impressive St George's tower, may be from this earlier period, and can be found a few yards from the Southern side of the motte.
Above. The motte from South.
The fact that the motte appears to have been built over Saxon remains, could indicate a symbolical burying of the old (Saxon) and replacement by the new (Norman) and a firm establishment of Norman control over the city.