Pre-History on the summit of
Skirrid Fawr Evidence of human activity in the
Mesolithic period has been found across Monmouthshire; examples include remains on the
Caldicot and Wentloog Levels and at
Monmouth. A major hoard of
Bronze Age axes was discovered at
St Arvans. The county has a number of
hillfort sites, such as those at
Bulwark and
Llanmelin Wood. The latter has been suggested as the capital of the
Silures, a
Celtic tribe who occupied south-east Wales in the
Iron Age. The Silures proved among the most intractable of Rome's opponents;
Tacitus described them as "exceptionally stubborn" and Raymond Howell, in his county history published in 1988, notes that while it took the Romans five years to subdue south-east England, it took thirty-five before complete subjugation of the Silurian territories was achieved.
Roman period '' at
Venta Silurum The
Roman conquest of Britain began in AD 43, and within five years the
Roman Empire's
legions had reached the borders of what is now Wales. In south east Wales they encountered strong resistance from the Silures, led by
Caratacus (Caradog), who had fled west after the defeat of his own tribe, the
Catuvellauni. His
final defeat in AD 50 saw his transportation to Rome, but Silurian resistance continued, and the subjugation of the entirety of south east Wales was not achieved until around AD 75, under the governor of Britain,
Sextus Julius Frontinus. Monmouthshire's most important Roman remains are found at the town of
Venta Silurum ("Market of the Silures"), present-day
Caerwent in the south of the county. The town was established in AD 75, laid out in the traditional rectangular Roman pattern of twenty
insulae with a
basilica and a temple flanking a
forum. Other Roman settlements in the area included
Blestium (Monmouth). The
Romanisation of Monmouthshire was not without continuing civil unrest; the defences at Caerwent, and at Caerleon, underwent considerable strengthening in the late
2nd century in response to disturbances. The Silurian identity was not extinguished: the establishment of a
Respublica Civitatis Silurium (an early town council) at the beginning of the
3rd century testifies to the longevity of the indigenous tribal culture.
Sub-Roman period The
Roman abandonment of Britain saw the division of Wales into a number of
petty kingdoms. In the south east (the present county of Monmouthshire) the
Kingdom of Gwent was established, traditionally ascribed to
Caradoc, in the 5th or 6th centuries. Its capital, Caerwent, gave the name to the kingdom. The subsequent history of the area prior to the Norman Conquest is poorly documented and complex. The Kingdom of Gwent frequently fought with the neighbouring Welsh kingdoms, and sometimes joined in alliance with them in, generally successful, attempts to repel the
Anglo-Saxons, their common enemy. The
Book of Llandaff records such a victory over the Saxon invaders achieved by
Tewdrig at a battle near
Tintern in the late 6th century. An example of the alliances formed by neighbouring petty kings was the
Kingdom of Morgannwg, a union between Gwent and its western neighbour, the Kingdom of
Glywysing, which formed and reformed between the 8th and the 10th centuries. The common threat they faced is shown in
Offa's Dyke, the physical delineation of a border with Wales created by the
Mercian
king. For a brief period in the 11th century, Monmouthshire, as Gwent, became part of a united Wales under
Gruffydd ap Llywelyn, but his death in 1063 was soon followed by that of his opponent
Harold Godwinson at the
Battle of Hastings, and the re-established unity of the country was to come from Norman dominance.
Norman period and Middle Ages – stronghold of the
Lords of Striguil and "the glory of medieval south Wales" The
Norman invasion of South Wales from the late 1060s saw the destruction of the Kingdom of Gwent, and its replacement by five
Marcher lordships based at
Striguil (Chepstow), Monmouth, Abergavenny, Usk and Caerleon. The Marcher Lord of Abergavenny,
Gilbert de Clare, 7th Earl of Gloucester, described the rule of the lords as
sicut regale ("like unto a king"). The lords established castles, first earth and wood
motte-and-bailey constructions, and later substantial structures in stone. Among the first were
Chepstow Castle, begun by
William FitzOsbern, 1st Earl of Hereford as early as 1067, and that at
Tregrug, near
Llangybi, by de Clare's son,
Gilbert. The historian John Kenyon describes Chepstow as "one of the great strongholds of Europe". In the early Norman period, the cleric and chronicler,
Geoffrey of Monmouth (c. 1095 – c. 1155), who may have been born at Monmouth, wrote his
The History of the Kings of Britain, with a focus on
King Arthur and on his capital,
Camelot, which Geoffrey located at
Caerleon (now in
Newport), and which remained highly influential for centuries, although modern scholars consider it little more than a literary forgery. Christmas 1175 saw an outbreak of particular violence in the gradual extension of Norman control over South Wales. The Marcher lord
William de Braose invited
Seisyll ap Dyfnwal, lord of Upper Gwent, and an array of other Welsh notables to a feast at
Abergavenny Castle. De Braose proceeded to have his men massacre the Welsh, before sending them to burn Seisyll's home at
Castell Arnallt and to murder his son, intending the obliteration of the indigenous Gwent aristocracy. A wave of Welsh retaliation followed, described in detail by the contemporary chronicler,
Gerald of Wales. Monmouthshire's Norman castles later became favoured residences of the
Plantagenet nobility.
Henry of Grosmont, Duke of Lancaster (c. 1310–1361), was reputedly born at
Grosmont Castle, home of his father
Henry, 3rd Earl of Lancaster, grandson of
Henry III. Becoming the richest and among the most powerful lords in England, Grosmont developed the castle as a sumptuous residence, while the village became an important medieval settlement.
Henry V (1386–1422) was born at his father's castle at
Monmouth in 1386, and his birth, and his most famous
military victory, are commemorated in
Agincourt Square in the town, and by a statue on the frontage of the
Shire Hall which forms the square's centrepiece. In Henry V's wars in France, he received strong military support from the archers of Gwent, who were famed for their skill with the
Welsh bow. Gerald recorded, "the men of Gwent are more skilled with the bow and arrow than those who come from other parts of Wales". There was a brief reassertion of Welsh autonomy in Monmouthshire during the
Glyndŵr rebellion of 1400 to 1415. Seeking to re-establish Welsh independence, the revolt began in the north, but by 1403
Owain Glyndŵr's army was in Monmouthshire, sacking
Usk and securing a victory over the English at
Craig-y-dorth, near
Cwmcarvan. According to the
Annals of Owain Glyn Dwr, "there the English were killed for the most part and they were pursued up to the gates of the town" (of Monmouth). His son and heir
Henry VIII was to bring the rule of the
Marcher lords to an end. The historic county of Monmouthshire was formed from the
Welsh Marches by the
Laws in Wales Act 1535. The Laws in Wales Act 1542 enumerated the counties of Wales and omitted Monmouthshire, implying that the county was no longer to be treated as part of Wales. Though for all purposes Wales had become part of the
Kingdom of England, and the difference had little practical effect, it did begin a centuries-long dispute as to Monmouthshire's status as a
Welsh or as an
English county, a debate only finally brought to an end in 1972. The laws establishing the 13 counties (shires), the
historic counties of Wales, assigned four of the five new counties created from the Marcher Lordships along the Welsh/English border,
Brecknockshire,
Denbighshire,
Montgomeryshire and
Radnorshire, to the legal system operated in Wales, administered by the
Court of Great Sessions. Monmouthshire was assigned to the
Oxford circuit of the
English Assizes. This began a legal separation which continued until 1972; for example, the administrative county of Monmouthshire and the boroughs of Newport, Abergavenny and Monmouth were explicitly listed as being in England rather than Wales in first schedule of the
Local Government Act 1933. For several centuries, acts of the
Parliament of England (in which Wales was represented) often referred to "Wales and Monmouthshire", such as the
Welsh Church Act 1914.
Civil war and religious strife Monmouthshire in the 1600s experienced to a high degree the political and religious convulsions arising from the
English Reformation and culminating in the
English Civil War. Following
Henry VIII's religious reforms, the county had a reputation for
recusancy, with the strongly Catholic
Marquesses of Worcester (later Dukes of Beaufort) at its apex, from their powerbase at
Raglan Castle. The outbreak of war saw the county predominantly
Royalist in its sympathies;
Henry Somerset, 1st Marquess of Worcester expended a fortune in support of
Charles I and twice entertained him at Raglan. His generosity was unavailing; the castle fell after a siege in 1646; the marquess died in captivity and his
son spent time in prison and in exile abroad.
John Arnold,
member of parliament for
Monmouth Boroughs in the late 17th century, was a virulent opponent of Catholics and pursued a policy of harassment from the 1670s. Monmouthshire's only
dukedom was created in 1663 for
James Scott, 1st Duke of Monmouth, but became forfeit following Scott's execution after the failed
Monmouth Rebellion in 1685. In the 18th and much of the 19th centuries county politics was dominated by the Beauforts and the
Morgans, "an everlasting friendship between the houses of
Raglan and
Tredegar", and by the end of the 19th century, these two families, along with the
Hanburys of Pontypool, held between them over a fifth of the total land in the county.
Industrialisation was sentenced to death at Monmouth after the failure of the
Newport Rising Industrialisation came early to Monmouthshire; the first
brass in Britain was produced at a
foundry at
Tintern in 1568, and the lower Wye Valley and the
Forest of Dean became important centres for metalworking and mining. The most dramatic impact though was in the west of the county during the
Industrial Revolution, in the
South Wales Coalfield, where some of the largest pits in Wales were dug, and a major
iron industry developed. The societal transformation was accompanied by great inequality and unrest.
Chartism was firmly embedded in Wales, and in 1840 the Chartist leaders
John Frost,
Zephaniah Williams and
William Jones were tried for sedition and treason at the
Shire Hall, Monmouth, after a
failed insurrection at Newport, which the writer
Clive Aslet called "the first mass movement of the
working class". Their death sentences were subsequently commuted to
transportation to Australia. Industrialisation also drove improvements in transportation; in the 18th century, the poor state of Monmouthshire's roads approached a national scandal. During a debate in parliament on the establishment of a
turnpike trust for the county, the local landowner
Valentine Morris asserted that the inhabitants of the county travelled "in ditches". By the mid-century, commercial demands saw the first timetabled
stagecoach between London and Monmouth arrive in
Agincourt Square on 4 November 1763, the journey having taken four days. By the end of the century, the need for access to exploit the South Wales Coalfields saw the development of trams and canals.
Society, art and science Tourism became prominent in Monmouthshire at the end of the 18th century, when the
French Revolution and the subsequent
Napoleonic Wars precluded travel to
Continental Europe. The focus of activity was the
Wye Tour, first popularised by the Rev.
William Gilpin, in his
Observations on the River Wye and Several Parts of South Wales, etc. Relative Chiefly to Picturesque Beauty, published in 1782. Although his efforts were sometimes satirised, Gilpin established what became the conventional route down the "mazy course" of the
River Wye, with visitors embarking at
Ross-on-Wye, and sailing past
Symonds Yat, and Monmouth, before the highlight of the tour,
Tintern Abbey. Voyages concluded at Chepstow. The abbey at Tintern inspired artists and writers;
J. M. W. Turner painted it;
William Wordsworth committed it to verse; and
Samuel Taylor Coleridge almost died there. Another object of interest to artists undertaking the Wye Tour was the
Monnow Bridge at Monmouth. A late 18th-century watercolour by
Michael Angelo Rooker is now in the
Monmouth Museum. The noted architectural watercolourist
Samuel Prout painted the bridge in a study dated "before 1814", now held at the
Yale Center for British Art in Connecticut. In 1795,
J. M. W. Turner sketched the bridge and gatehouse during one of his annual summer sketching tours.
Alfred Russel Wallace, a
naturalist whose independent work on
natural selection saw
Charles Darwin bring forward the publication of
On the Origin of Species, was born at
Llanbadoc, outside
Usk, in 1823. He is commemorated in a statue raised in the town's Twyn Square in 2021.
Bertrand Russell, the philosopher and the only
Nobel laureate from the county, was born at
Cleddon Hall, outside
Trellech in 1872.
Charles Rolls grew up at his family seat,
The Hendre, just north of Monmouth and, in partnership with
Henry Royce, co-founded
Rolls-Royce Limited. An aviation pioneer, as well as an automobile innovator, he died in a plane crash in 1910, and is commemorated by a
statue in Agincourt Square in Monmouth.
War The
Royal Monmouthshire Royal Engineers was founded in 1539, making it the second-oldest regiment in the
British Army. Originally a county militia, it was amalgamated into the
Royal Engineers in 1877. It is based at
Monmouth Castle.
Fitzroy Somerset, a younger son of the
5th Duke of Beaufort, enjoyed a long military career, serving on the staff of the
Duke of Wellington at the
Battle of Waterloo, and as commander-in-chief of the British forces during the
Crimean War. Created
Baron Raglan in 1852, he died in 1855. His son was gifted
Cefntilla Court, near
Llandenny in his memory.
William Wilson Allen, who fought with the
South Wales Borderers at the
Battle of Rorke's Drift in 1879, is buried in
Monmouth Cemetery, the only grave in the county of a holder of the
Victoria Cross. The
Monmouthshire Regiment was established in 1907. Men from the regiment fought in both the
First and
Second World Wars, until its disbandment in 1967. was sunk at the
Battle of Coronel in November 1914, with the loss of all 734 crew.
Gwent 1974–1996 The
Local Government Act 1972, which came into effect in April 1974, created the county of Gwent, confirmed it as part of Wales, and abolished the historic
administrative county of Monmouthshire and its associated
lieutenancy. It also subsumed
Newport County Borough Council, creating a two-tier system of local government across the county. The entire county was administered by
Gwent County Council, based at
County Hall, Cwmbran, with five
district councils below it:
Blaenau Gwent,
Islwyn,
Monmouth,
Newport and
Torfaen. The largest five towns in the new county were
Newport,
Cwmbran,
Pontypool,
Ebbw Vale and
Abergavenny. In the
1979 Welsh devolution referendum Gwent voted heavily against the proposal for a Welsh Assembly with limited powers, with a "No Vote" of 87.9 per cent, with the national "No Vote" standing at 79.7 per cent.
Late 20th and 21st centuries The
Local Government (Wales) Act 1994 created the present
local government structure in
Wales of 22
unitary authority areas, the
principal areas, and abolished the previous two-tier structure of
counties and
districts. It came into effect on 1 April 1996. It brought to an end the 22-year existence of Gwent, and re-created the county of Monmouthshire, although only with the eastern three-fifths of its historic area, and with a substantially reduced population. The western two-fifths of the county were included in other principal areas:
Caerphilly County Borough, part of which came from Mid Glamorgan, including the towns of
Newbridge,
Blackwood,
New Tredegar and
Rhymney;
Blaenau Gwent County Borough, including
Abertillery,
Brynmawr,
Ebbw Vale and
Tredegar; Torfaen, including
Blaenavon,
Abersychan,
Pontypool, and
Cwmbran; and the
City of Newport, including
Caerleon as it had since 1974. The new Monmouthshire, covering the less populated eastern 60% of the historic county, included the towns of
Abergavenny,
Caldicot,
Chepstow,
Monmouth and
Usk. In his essay on local government in the fifth and final volume of the
Gwent County History, Robert McCloy suggests that the governance of "no county in the United Kingdom in the twentieth century was so transformed as that of Monmouthshire". The title of Gwent continues as a
preserved county, one of eight such counties in Wales, which have mainly ceremonial functions such as the
lord lieutenancy and
high shrievality. In 2024 the lord lieutenant was Brigadier Robert Aitken, appointed in 2016, and the high sheriff for 2026 is Mrs Shereen Williams. The preserved county is also retained for a limited number of public service bodies which operate across principal areas, for example
Gwent Police. In the
1997 Welsh devolution referendum for the establishment of a
National Assembly for Wales, which resulted in a narrow "Yes" vote, 50.30 per cent in favour v. 49.70 per cent against, Monmouthshire recorded the highest "No" vote of any principal area, its population voting 67.9 per cent against to 32.1 per cent in favour. ==Geography==