Offa's Dyke: Section extending 202m from River Teme to West Street

Cadw's description

Summary description and reason for designation

The following provides a general description of the Scheduled Ancient Monument.

The monument comprises a 220m long section of the early medieval boundary earthwork Offa’s Dyke, which runs discontinuously for roughly 120km through the border region between Wales and England from Sedbury near Chepstow to Treuddyn in Flintshire. It is traditionally thought to have been built by the Mercian King Offa in the later 8th century, but recent excavations on a section near Chirk suggest that some sections may incorporate earlier earthworks. Whilst its exact function and original form remain the subject of debate Offa's Dyke is significant as the longest and one of the earliest surviving boundary monuments in Europe marking a nominal frontier between Saxon Mercia and Welsh kingdoms to the west. It represents one of the great engineering achievements of the pre-industrial age and the most dramatic built structure to survive from the early medieval (c410-1100) period in the Britain. Offa’s Dyke normally comprises a substantial upstanding bank or scarp with a western ditch and occasionally the remains of quarry hollows to its east associated with the construction of the bank and is scheduled in multiple different sections on both sides of the present border. These have their own local physical characteristics and landscape settings but all share and contribute to its overall significance.

This section of Offa’s Dyke runs uphill and south from a steep scarp above the southern bank of the River Teme and faces west across its floodplain. The southern end is cut by West Street, the next 200m or so to the south having largely been destroyed by the present Offa’s Road and modern housing on its eastern side, beyond which it continues as RD016. These three sections define the western edge of the later medieval borough of Knighton (Tref-clawdd) and it is possible that the Dyke was later adapted as the line of its defences, which are mentioned in the 13th century.

The scheduled area is divided into two landholdings, the downhill northern stretch within Offa’s Dyke Park, the southern within the boundary of a former factory. The northernmost 90m within the park comprises an impressive bank and ditch, terminating on the edge of the spur above the Teme, the ground falling sharply away to the west towards the floodplain. The bank rises 1m or so above the level to the east but some 3m above the base of a substantial ditch to the west. The summit is unusually sharp and stony and may indicate later adaptation as a land boundary or possibly part of Knighton’s town defences. A commemorative stone at its northern end marks the opening of the Offa’s Dyke National Trail in 1971. The Dyke climbs out of the park to the south into the former factory plot, of which it forms the western boundary. Here the bank is a substantial earthwork up to 2.5m above the ground to the east, probably accentuated by levelling and landscaping for the factory buidings and associated hardstanding, which have cut vertically into its rear. The reduced front of the bank and any traces of a former ditch lie within a series of gardens to the west and is not designated.

This is a well-preserved section of Offa’s Dyke, displaying a full bank and ditch profile at its northern end. The upstanding earthworks and associated buried archaeology hold significant potential to enhance our knowledge of the construction use, decay of both this section of the Dyke and of the monument as a whole. There is a high probability of the presence of archaeological features and associated deposits retaining artefactual, environmental and dating evidence and the earthworks are likely to seal pre-Dyke ground surfaces and soils which may provide evidence of the landscape and environment into which it was imposed. It is of additional significance due to its possible reuse as part of Knighton’s medieval town defences, and the Offa’s Dyke Path inauguration stone, the National Trail having played an important role in the raising public awareness of the monument.

The scheduled area comprises the remains described and areas around them within which related evidence may be expected to survive.