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Latitude: 51.8066 / 51°48'23"N
Longitude: -2.7214 / 2°43'17"W
OS Eastings: 350356
OS Northings: 212246
OS Grid: SO503122
Mapcode National: GBR FK.XCLK
Mapcode Global: VH86T.SV5D
Entry Name: Clawdd Du
Source ID: 3674
Cadw Legacy ID: MM036
Schedule Class: Defence
Category: Town defences
County: Monmouthshire (Sir Fynwy)
Community: Monmouth (Trefynwy)
Built-Up Area: Monmouth
Traditional County: Monmouthshire
The monument comprises the remains of a stretch of the medieval town defences. It consists of a long, curved, steep-sided ditch, 3m to 4m wide at the base and 2m deep, orientated roughly NW/SE to the W of the river Monnow. The ditch, which records show was also called the Black Dyke, was built to provide protection for the suburb of Overmonnow, which was an important iron and wool working centre during the medieval period. Originally there would have been a large bank on the inner (E) side of the ditch, possibly surmounted by a wooden palisade, but the ditch has been flattened. A stone bridge crosses the N end of the ditch, this is medieval in date and would have carried a road across the ditch towards the Monnow Bridge (MM008).
The monument is of national importance for its potential to enhance our knowledge of medieval defensive organisation and of the growth of towns. The monument forms an important element within the wider medieval context and the structure itself may be expected to contain archaeological information in regard to chronology, building techniques and functional detail.
The scheduled area comprises the remains described and areas around them within which related evidence may be expected to survive.