The Clawdd-du, also known in historical records as the Black Dyke, Black Ditch or Clawthy, is a mediaeval linear defensive earthwork or moat, constructed as protection for the ''

faubourg "Faubourg" () is an ancient French term historically equivalent to " fore-town" (now often termed suburb or ). The earliest form is , derived from Latin , 'out of', and Vulgar Latin (originally Germanic) , 'town' or 'fortress'. Traditionally, t ...

'' of

Overmonnow Overmonnow is a suburb of the town of Monmouth, in Wales, which is located to the west of the River Monnow and the Monnow Bridge. It developed in the Middle Ages, when it was protected by a defensive ditch, the '' Clawdd-du'' or "Black Dyke", the ...

, on the opposite side of the

River Monnow The River Monnow ( cy, Afon Mynwy) marks the England–Wales border for much of its length. After flowing through southwest Herefordshire, England, and eastern Monmouthshire, Wales, its confluence with the River Wye is approximately south of ...

from the town and castle of Monmouth,

Wales Wales ( cy, Cymru ) is a country that is part of the United Kingdom. It is bordered by England to the east, the Irish Sea to the north and west, the Celtic Sea to the south west and the Bristol Channel to the south. It had a population in ...

History

The areas west of the River Monnow remained, in general, under Welsh control much later than the areas to the east, which included the town of Monmouth where the

Normans The Normans ( Norman: ''Normaunds''; french: Normands; la, Nortmanni/Normanni) were a population arising in the medieval Duchy of Normandy from the intermingling between Norse Viking settlers and indigenous West Franks and Gallo-Romans. ...

established a castle shortly after 1067. The suburb of Overmonnow, which in mediaeval times was an important area for iron working and the manufacture of coarse

woollen Woolen (American English) or woollen (Commonwealth English) is a type of yarn made from carded wool. Woolen yarn is soft, light, stretchy, and full of air. It is thus a good insulator, and makes a good knitting yarn. Woolen yarn is in contrast t ...

material including

Monmouth cap The Monmouth cap (Welsh: ''Cap Trefynwy'') was an item of woollen headgear fashionable between the 15th and 18th centuries, and associated with the town of Monmouth in South East Wales. The knitted round caps were used by both soldiers and sa ...

s, would have been vulnerable to attacks from the Welsh at the time the defences were constructed. Excavations in 1966 suggested that the ditch was excavated in two stages, before the mid-thirteenth century, and then again after the mid-fourteenth century. The ditch originally extended, roughly in a semi-circle, for some from the River Monnow opposite Chippenham Fields, westwards and then northwards to the vicinity of the later

Drybridge House Drybridge House is a large 17th-century Grade II* listed building in Monmouth, south east Wales. It is located to the southwest of the town at one end of Drybridge Street, close to the “dry bridge” over a small stream, which is now buried b ...

. The defence comprised a water-filled ditch some 35 to 40 feet (10-12m) wide, with an embankment some 5 feet (1.5m) high on the side of the settlement, topped by a wooden palisade.M.L.J. Richards, ''Monnow Bridge and Gate'', Alan Sutton Publishing, 1994, , p.3 It was probably possible to flood the ditch from the River Monnow. A mediaeval stone bridge across the ditch was in direct line with that of Monnow Street, in Monmouth, and the Monnow Bridge across the river. It carried the road from the town westwards towards the village of Wonastow.Kissack, ''Mediaeval Monmouth'', p.24 The Clawdd-du defined the outer limit of development at Overmonnow until the 1930s.

The Clawdd-du today

The Clawdd-du is now partly infilled, but still exists for most of its length as a broad ditch used for drainage. It is a

Scheduled Ancient Monument In the United Kingdom, a scheduled monument is a nationally important archaeological site or historic building, given protection against unauthorised change. The various pieces of legislation that legally protect heritage assets from damage and d ...

, and the remains of the mediaeval bridge are a

Grade II* listed building In the United Kingdom, a listed building or listed structure is one that has been placed on one of the four statutory lists maintained by Historic England in England, Historic Environment Scotland in Scotland, in Wales, and the Northern Ir ...

. In 2010, local archaeologists objected to

Monmouthshire County Council Monmouthshire County Council (or simply Monmouthshire Council) ( cy, Cyngor Sir Fynwy) is the governing body for the Monmouthshire principal area – one of the unitary authorities of Wales. The current unitary authority was created in 1996 a ...

because a trench had been dug along the site without proper consent. Sam Malone, ''Archaeologist says council is destroying historic site'', Western Mail, 24 September 2010
Accessed 27 January 2012

References

{{Buildings in Monmouth Archaeological sites in Monmouthshire Fortification (obstacles) Buildings and structures in Monmouth, Wales History of Monmouth, Wales Scheduled monuments in Monmouthshire Linear earthworks