Silchester (Calleva) experienced major disruption in the late first century A.D. as the Iron Age oppidum was transformed into the Roman city responsible for the administration of the civitas of the Atrebates. Aligned on the cardinal points, a rectilinear street grid was laid across the settlement replacing the late Iron Age network of streets and lanes oriented north-west/south-east and north-east/south-west. While the pre-existing property boundaries...