Monnow Bridge: A Medieval Fortified Bridge in Wales
Site at a Glance
- Rating
- 4.5
- Popularity
- Low
- Country
- United Kingdom
- Primary era
- Medieval
- External website
- Open
- Eras represented
- Medieval, Modern
- Civilizations
- British, English, Norman
- Site type
- Military
- Remains
- Fortified Bridge
On this page13 sections
History
Monnow Bridge is a late-13th-century medieval bridge in Monmouth, Wales, United Kingdom, built during the development of the Norman border settlement on the Welsh Marches. It is the only surviving fortified river bridge in Great Britain whose gate tower stands on the bridge itself. The crossing spans the River Monnow about 500 metres upstream from its confluence with the River Wye, and its position reflects Monmouth’s long history as a defensive and commercial centre.
Roman and Norman Monmouth
Monmouth was an important settlement in Roman Britain. It contained the fort of Blestium, a Roman military site associated with the occupation, and an important local ironworking centre. A bridge may have crossed the River Wye during the Roman period, but the easily fordable Monnow apparently remained without a bridge until after the Norman Conquest.
Around 1070, the Norman lord William FitzOsbern built a castle near the meeting of the two rivers. During the next two centuries, a Benedictine priory was established and Monmouth grew into a defensive settlement on the Welsh Marches, the medieval borderlands between England and Wales where castles, fortified towns, and other defensive works were especially important.
The first known crossing of the Monnow was a timber bridge built in the mid-12th century. Flood-defence work in 1988 exposed its remains beneath the present bridge. Dendrochronology, the dating of timber by examining its annual growth rings, showed that the trees used for the structure were felled between 1123 and 1169.
The medieval bridge and gate
A passage in Flores Historiarum by the medieval chronicler Roger of Wendover may indicate that the timber bridge and the nearby Church of St Thomas the Martyr were damaged by fire during the Battle of Monmouth in 1233. The battle was fought between supporters of Henry III and the forces of Richard Marshal, Earl of Pembroke. The location of the fighting and the identity of the bridge involved remain disputed. Keith Kissack placed the battle at Vauxhall Fields below Monmouth Castle, while other historians located it at Overmonnow.
The stone bridge was completed in the late 13th century, probably replacing the Norman timber crossing. Local tradition places the beginning of construction around 1272, but no surviving documentary evidence supports that precise date. Monnow Gate was added at the end of the 13th century or the beginning of the 14th, approximately 25 to 30 years after the bridge. Its position in the middle of the crossing was unusual, since fortified bridge gates were more commonly placed at one end.
In 1297, Edward I granted Monmouth a murage grant, a royal authorisation to raise money for building or repairing town walls and gates. The grant was requested by his nephew Henry of Lancaster and included work associated with Monnow Gate. The authority was renewed on 1 June 1315 because the work remained incomplete or required repair.
The bridge and gate formed part of Monmouth’s defensive system, although their primary purpose has long been debated. Some historians regarded the gate chiefly as a toll-collection point, noting that the Monnow could be crossed on foot upstream. Others argued that it had a clear defensive function. Michael Rowlands concluded that the structure served both defence and revenue collection.
In the medieval period, the gate controlled entry into Monmouth and collected tolls from people attending the town’s markets. The 1297 and 1315 records, together with later town charters, authorised charges on goods including livestock, honey, and roofing nails. Much of medieval Monmouth’s development was financed through taxes and tolls granted by royal charter. In 1447, Henry VI granted the town a charter of incorporation, allowing further civic and commercial development. The bridge continued to operate as an important toll gate and entrance to the town.
Conflict, trade, and changing use
Monmouth and its castle were not attacked during the rebellion led by Owain Glyndŵr, the Welsh leader whose uprising against English rule began in 1400 and continued into the early 15th century. Nearby Abergavenny and Grosmont were burned, however, and the unrest hindered Monmouth’s development.
The bridge remained closely tied to trade. In 1589, Philip Jones, Member of Parliament for Monmouth Boroughs, left the mayor and bailiffs an annual income of about £120 from his lands and houses at Bayliepitte. His gift required people passing through the gate, or bringing cattle into Monmouth, to be exempt from tolls on fair days.
During the English Civil War, Monmouth changed hands several times. In 1645, Royalist soldiers from Raglan seized the bridge in an unsuccessful attempt to retake the town from Parliamentarian forces commanded by Colonel Kyrle. Eight of the Royalists’ opponents were killed and five were captured.
By 1705, the bridge and gatehouse required repair. The original battlements were replaced by solid walls, and the gatehouse was converted into a two-storey dwelling. Timber-and-lath extensions projected over the river, while part of the building continued to serve as a lock-up. A resident gatekeeper was responsible for maintenance. Further repairs took place between 1771 and 1775, and the bill included 100 gallons of ale for the workmen. The continuing commercial importance of the crossing is illustrated by an early-18th-century Saturday when 500 horses, each carrying five bushels of corn, entered through Monnow Gate.
By 1804, the gatehouse was no longer a residence. It was used occasionally as a guardhouse or powder store for troops stationed in Monmouth. Its lean-to extensions, including the guardhouse, were demolished around 1815. A pedestrian passage was opened through the upstream side of the gatehouse in 1819 to reduce congestion. The roof was reconstructed in 1832, and a second passage was added on the downstream side in 1845.
Ownership, conservation, and modern protection
Before 1830, the gatehouse belonged to Monmouth Corporation. It subsequently passed to the county council, and between 1830 and 1835 ownership was formally transferred to the Duke of Beaufort as part of a property exchange. During the Newport Rising of 1839, an armed Chartist demonstration in South Wales, authorities garrisoned the gatehouse because they feared an attack on Monmouth. Later guidebooks attributed its three loopholes to this episode, although illustrations show that the openings existed well before 1839.
Until confrontations were banned in 1858, the gatehouse was the setting for annual “muntlings” between rival youth gangs from Up-Town and Overmonnow, also known as Cappers’ Town. Held on 1 and 29 May, the gatherings involved besoms, or “muntles,” reinforced with stones. The bridge also served as an unofficial advertising hoarding and as a place for local and national celebrations. In 1891, it was decorated with flags and lights to mark the coming of age of John Maclean Rolls, eldest son of Lord Llangattock.
From 1889 to 1902, Monmouthshire County Council directed an extensive conservation programme. The work stabilised the gatehouse, repaired the arches and piers, addressed erosion of the riverbed, replaced deteriorated stone, improved drainage, and restored parts of the exterior and interior. The gatehouse opened to the public in 1902. In the same period, ownership passed from Henry Somerset, 9th Duke of Beaufort, to Monmouthshire County Council as part of the disposal of the Somerset family’s Monmouthshire landholdings. A brass plaque on the gatehouse records the transfer.
The bridge and gate were formally protected as an Ancient Monument in 1923. They became a scheduled monument on 24 July 1974, while the associated listed building, officially named “Monnow Bridge and Gateway,” received Grade I status on 15 August 1974. In 1996, Monnow Bridge was included by the International Council on Monuments and Sites, the UNESCO advisory body, on a list of potential World Heritage Bridges. The criteria concerned outstanding universal value and the importance of a significant stage in bridge engineering or technological development.
Increasing traffic, poor visibility on the humpbacked bridge, and narrow approach roads caused repeated accidents during the 20th century. A double-decker bus struck the bridge on 18 May 1982, forcing its closure for a month. In the early 1990s, two drivers were prosecuted after crossing with vehicles substantially above the height and weight limits. The A40, built in 1965 and 1966, relieved Monmouth of much through traffic. A further crossing was studied by Ove Arup and Partners in 1999, and construction began after local authorities secured funding in 2003. The new bridge opened to local traffic on 15 March 2004, allowing Monnow Bridge to become pedestrian-only and enabling a major repair programme. After further conservation, the gatehouse was formally reopened in 2014.
Remains
Monnow Bridge is a 34.8-metre-long, 7.3-metre-wide stone crossing over the River Monnow. It has three arches supported by two piers in the river, with each pier forming a cutwater, a pointed structure designed to divide the flow around it. The arches have ribbed undersides for reinforcement. Seven types of stone were used, predominantly Old Red Sandstone quarried within approximately 16 kilometres of Monmouth. The bridge’s unusual character comes from Monnow Gate, which rises about 11 metres above the bridge deck instead of standing at one end.
The bridge structure
Arches and piers
The three arches carry the crossing between the river banks, while the two river piers support the spans and present cutwaters to the current. Riverbed erosion seriously undermined the piers before conservation of the arches and foundations began in 1892. The work replaced badly eroded stone with squared blocks of Old Red Sandstone and improved the bridge’s drainage. The crossing now carries pedestrian traffic.
Monnow Gate
Gateway and elevations
Monnow Gate has an elliptical plan and presents two markedly different elevations. The western side is more elaborately decorated, with three prominent arched machicolations, projecting openings through which defenders could drop stones or other material on attackers. Their exact date is uncertain, although comparison with similar examples suggests construction during the 14th century. They cannot have belonged to the original gatehouse because their position would have obstructed the portcullis, a vertically sliding defensive gate. The eastern elevation is less ornate and includes a centrally placed round-headed window, showing the different treatments or rebuilding phases preserved in the tower.
Passages and internal rooms
The original gateway formed the only route into and out of the bridge and was protected by a portcullis. Its grooves remain visible. The two pedestrian passages are later additions: the upstream passage dates from 1819 and the downstream passage from 1845. Their openings differ in form. The northern arch is pointed, while the southern arch has a flat Caernarvon head.
Inside the gatehouse are a single room and a garderobe, a medieval latrine or privy. Access was originally provided by a stone spiral staircase, later destroyed and replaced by a wooden staircase. The tower room is approximately 10 metres long and 3 metres wide. It has an attic and an 18th-century roof reconstructed in 1832, whose machine-cut rafters can be seen from the upper room. Drawings from the 18th and 19th centuries show a chimney on the roof, although the presence of a fireplace in the tower room is not established. The medieval roof was flat, with a castellated parapet and wall-walk.
Conservation features
The conservation programme of 1889 to 1902 inserted metal tie rods to hold the two faces of the tower together. Four circular plates at the rod ends remain visible. The same programme added roof gutters and downpipes and restored a cruciform arrowslit on the western elevation. These repairs form part of the visible fabric of the present gatehouse.
Artistic record
From the late 18th century onward, Monnow Bridge and its gatehouse attracted repeated attention from artists, encouraged in part by William Gilpin’s published account of the Wye Tour. Michael Angelo Rooker made a late-18th-century watercolour, now held by Monmouth Museum, while Samuel Prout produced a study before 1814, held by the Yale Center for British Art. J. M. W. Turner sketched the bridge and gatehouse in 1795.
John Sell Cotman’s early-19th-century drawing records the overhanging accommodation and guardhouse before their removal, and Joshua Cristall made a similar pencil drawing in 1803. Henry Gastineau drew the bridge around 1819, although a printing error led some printed collections to confuse the image with a tower at Raglan Castle. Thomas Moran later produced an undated pencil drawing, and Charles Eamer Kempe depicted the bridge in stained glass in the Boer War memorial window at St Mary’s Priory Church in Monmouth.
