Post-Roman Britain

The well-known date of Britain's final official break from Rome is AD 410, but by that stage Roman Britannia had mostly been fighting its own battles for nearly thirty years with only occasional support from Rome. It was forced to look after its own interests in the face of increasing barbarian raids; from the Picts to the north, the Scotti and Irish to the west, and from various Teutonic tribes to the south and east.

There had been frequent barbarian raids throughout the fourth century in Britain. The Barbarian Conspiracy in 367 was a three-fold attack by Teutons from across the North Sea, and Picts and Scotti from the north and west.

Magnus Maximus

The next crisis faced by Britain came in 383, when the military commander, Magnus Maximus, realised that Roman power in the region was becoming increasingly toothless, and made his own claim to imperial power, supported by the army. His death in 388 deprived the island of the greatest part of its military strength, although the reorganisations usually attributed to him shored up the north and western coasts of Britain. However, there appears to have been almost continual warfare against the Picts during this period.

In about 398, Britain apparently had to be rescued from her barbarian foes, this time by the most powerful general of the Western Roman Empire, Stilicho. Stilicho's intervention was the last occasion on which a major expedition was mounted against the enemies of Britain.

Soon after the situation had been retrieved, Roman forces on the island were further reduced to serve Italy against the invading Goths. By 406, Britain's military strength had been largely drained away, and the following decade completed the process.

In 406 a vast army of barbarians crossed the frozen Rhine and began advancing westwards towards the Channel coast. It began to appear as though Britain might be invaded.

Constantine III

Earlier in the same year, the army in Britain had already elevated an unknown soldier, Marcus, to supreme power. He did not last long, being supplanted at the time of the barbarian advance through Gaul by Gratian, an urban magistrate (magistratum). Gratian survived only four months, and the army's next choice fell on a soldier, Constantine, who challenged Roman authority in Gaul, creating a prefecture at Arles from which to rule as Emperor Constantine III.

Constantine had, in 407 removed at least something of Britain's remaining trained forces only to be killed in 411 at Arles. The troops never returned but instead may have largely settled in Armorica, paving the way for a later British migration there.

In 408/409, Britain was subjected to a largescale barbarian invasion, probably by Saxons, with Anglian support.

The British civitates - the urban centres - managed to defend themselves and by 409 had quelled the attack, although details of how they did this are not available. It is possible that many of the surviving defeated Saxons and Angles were employed as foederati - mercenary troops - to garrison the Saxon Shore (the east coast) and protect it from further attacks. Although this was established Roman practise, and undoubtedly in use before this time, this action would help to explain the large number of Teutonic sites along Britain's east coast that are evident from before the Adventus Saxonum in 450.

Abandonment by Rome

In 410, the feeble emperor Honorius informed the internal government of Britain that it would have to look after its own defence, implying that this would be a permanent arrangement. During what was either a revolt of peasants and slaves in Britain in 409 to mirror either the popular uprising of the oppressed classes in Armorica (Brittany), or at the tail end of the barbarian invasion, the Romano-British governor had appealed for imperial help.

In the face of this abandonment by Rome, the defence of Britain was left to the western and northern kingdoms and whatever remained of the central government, essentially operating under a traditional Celtic High King, who may well have used the title Emperor of Britain while it still meant anything.

Theoretically, Vortigern could have been the first of these, with Ambrosius Aurelianus, and Arthur following them (Uther Pendragon is harder to pin down, but would have ruled between Ambrosius and Arthur, unless, of course, he was in reality the same person as Ambrosius, an argument not within the scope of this feature).

Border client kingdoms

Welsh tradition has long held that Magnus Maximus arranged the island's defences before making his expedition abroad to claim the Imperial title. Other sources attribute some of the changes to Vortigern, so a combination of the two is highly likely. Magnus Maximus, though, began the work, and seems likely to have made the biggest changes. What he did was to arrange large defensive areas that could be governed by client tribes or native Roman officers.

All of these were set up in the militarised zones, in the west and north, areas that had never been fully Romanised and had been under military control through several chains of forts. The borders shown in the map below are mostly conjectural, but are based on later kingdoms that emerged in these areas, through the inevitable fragmentation that occurred when Celtic tradition demanded an equal distribution of land between surviving sons.

The south and east, areas far more greatly Romanised, came under the island's central administration, for as long as it lasted. This explains the proliferation of early independent Celtic kingdoms in the west and north, while the heart of the Celtic Lloegr (ie. England) was much slower to fragment, and perhaps because of that, was a much easier area from which Angles and Saxons could grab territory.

However, kingdoms did emerge in the south and east, mostly towards the end of the fifth century, and some of these left evidence of their survival, if not their names. (details of these can be accessed from the next map in the series, The Island of Britain).

Ceretic Guletic, King of Alt Clut

Ceretic was the first king of Alt Clut (Strathcluaide) in this period, and perhaps the first to be recognised by Britain's administration. However, it seems certain that the kingdom was created in AD 148 by a descendant of the last free High King of Britain, Caratacus. This was one of the 'four kingdoms of (Lowland) Scotland' which held the territory between 'proper' Roman Britain and the Pictish north. Most of them may have maintained Roman client kingdom status for much of their existence before 409.

Ceretic ruled his territorium from the place from which the kingdom took its name, a rocky promontory overlooking the Clyde. This capital became known as the Fort of the Britons, Dun Breaton (and later, Dunbarton). Policing the western half of the Antonine Wall as a probably Roman client chieftain, Ceretic and his descendants forged a strong but poorly recorded kingdom which, alone amongst the British kingdoms outside Cymru, was never successfully conquered by the English. Instead, after becoming a Pictish/Scottish satellite state in the ninth century, it was fully merged within Scotland in the eleventh century.

Kingdom of Goutodin

Although Cunedda Wledig originated from this region if, as per tradition, he was moved by Magnus Maximus, he would have been in North Wales by 383. The first known king of Goutodin is Lot Lwyddog, who reigned around the end of the fifth century - before that there seems to be little information on this northern tribe, and it is possible that the Votadini chieftains, late in accepting the benefits of Roman civilisation, were also late to unite and form a single political entity.

Nora Chadwick's The Celts theorises that Coel Hen and his descendants guarded this eastern end of the Antonine Wall, in the buffer zone between that and Hadrian's Wall. Could Coel Hen have commanded, as governor of the militarised zone of north Britain, the Votadini chieftains, perhaps dealing directly with one high-chieftain? It seems highly plausible that after the death of Ceneu ap Coel, Coel Hen's son, the Votadini, or Goutodin, would seek to emulate the kingdoms being formed by his sons to the south. As a kingdom, Goutodin may well have been born only by around 470, with Lot Lwyddog as its first ruler.

Unfortunately, the kingdom never had a stable line of succession, and after the rulers (a king and a probable sub-king) were defeated at Catreath in around 597, as described in the Gododdin, the Kingdom of Goutodin was fatally weakened, and its remnants fell in 638 to the Angles of Bernicia.

Coel Hen, King of Northern Britain

The capital of Late Roman Britain in the north was Eboracum, later Ebrauc to the British, Eorforwic to the English, and contorted into York by the Danes. This was the civitas capital of the Brigantian Britons, who as pre-Roman Celts had ruled a huge swathe of central northern England for some centuries. Archaeological evidence points to a period of rebuilding in York at the start of the fifth century, when Coel Hen was at the height of his governorship of the region. But, formed partly it seems from the Roman military district of Valentia, the Kingdom of Northern Britain covered the whole of the Roman militarised zone from a line close to the Humber to Hadrian's Wall and a lesser sphere of influence for some distance beyond it (perhaps including the Votadini, as mentioned above).

Quite possibly appointed to his position by the departing Magnus Maximus, Coel Hen was probably the last Roman-style dux brittanniarum, and would have ruled in a very Romanised way. He held the north in a strong protective grip, and guaranteed that he and his immediate descendants had little trouble from the Picts to the north. Unfortunately, his descendants divided what was a very strong single political entity into a patchwork of small kingdoms that fell one by one to the Angles.

Cunedda Wledig, King of North Wales

The ninth century Historia Brittonum (The History of Britain, attributed to a certain Nennius) is the earliest source for Welsh history outside the Lives of the Saints, and it records that a certain Cunedag (Welsh Cunedda), together with eight of his sons and one grandson, came from Manau Goutodin (near the Firth of Forth) a hundred and forty-six years before the reign of Maelgwyn, king of Gwynedd, and that they had expelled the Irish forever from those lands.

This was the primary reason behind the decision to invite Cunedda to become "King of North Wales" as he was styled (although this appellation probably came much later, after his lifetime - he was never referred to as rex, "king", in the Historia). Maelgwyn's reign began in 517, so this places Cunedda's migration at 371, which seems a little early. Magnus Maximus is usually credited with reorganising the country's defences leading up to his departure in 383, and it is this date that is more traditionally linked with Cunedda, so something between 380 - 383 seems more acceptable for the move.

Cunedda and his people quickly settled in Gwynedd, carrying out their task of expelling the Irish invaders who had begun to settle there. The process of "freeing" North Wales seems to have lasted a few years, until the only Irish stronghold remained on Ynys Mon (the Isle of Anglesey). Signs of Irish settlement in the area can still be found opposite Irish Leinster, in the probable origin of the Lleyn peninsula - the long "pig's ear" - as its name may contain Irish Laigin, "Leinstermen".

Antonius Donatus Gregorius, King of South Wales

Antonius, also known to Welsh tradition as Anawn Dynod, was another son of Magnus Maximus, set up in his own territorium by his father or shortly after his departure. The positioning of Demetia, kingdom of the Demetae Britons, meant that it could protect the south west coastline from Irish raids.

The South Wales region soon crystallised into the kingdom of Demetia, later Dyfed. and was made up of two main regions. The larger part of the territory was Dyfed itself, and Ystrad Towy (or Towi) made up the eastern third or so. This was conquered in around 690 by Ceredigion, but Wales was united under the kings of Gwynedd in the ninth century, and Dyfed came to form the heart of a united South Wales after that, continuing through Deheubarth. The later kingdom of Brycheiniog also seems to have (at least partially) formed part of the South Wales territory.

As a complete opposite of the process going on in North Wales at the same time, Irish settlement in Demetia was actively encouraged, in the form of inviting the Irish Deisi tribe to settle there. They seem to have been brought in to act as foederati on the west coast, keeping the British shores clear of Irish raiders, an apparently successful policy. In the region, many Irish words are mixed into the regional dialect, and there is a considerable spread of memorial stones pointing to Irish influence. The incidence of Ogham (Irish) symbols, highest in the modern county of Dyfed, is a crude guide to the settlement of the Deisi, and after the British line of rulers had died out, the Deisi were best placed, through intermarriage, to assumed the legitimate rule of Dyfed.

Owain Finddu, King of Mid-South Wales (Cernyw)

Although many later Welsh kings claimed descent from Magnus Maximus in order to legitimise and enhance their own status, Owain Finddu has one of the better claims, and his territory seems to have been created to plug a gap between South Wales and Ewyas.

The kingdom of Cernyw emerged from this with Owain's son, and was renamed after Owain's great-grandson as Glywyssing. Even later, in the tenth century, it was again renamed after one of its most powerful late rulers as Morgannwg, and is remembered as today's Glamorgan region.

Meirchion, King of Ewyas

Probably the great-grandnephew of Eudaf Hen (the Old), former king of Ewyas, Meirchion son of Gwrgant seems to have been the last king of Ewyas. The kingdom was without a ruler in around 430 so that Vortigern was able to give it to his eldest son, Vortimer. Vortimer appears to have been able to claim the area as his inheritance through the maternal line as a great grandson of Eudaf Hen.

Ewyas as a distinct region seems to date from at least the late third century, and was situated at the very centre of what in the mid-fourth century became the Roman civil administration's province of Britannia Prima, stretching from Cornubia to North Wales and east to the Gloucester and Cirencester areas.

Vortigern, King of Pagenses (Powys)

The Pagenses appears to have grown into a recognisable region and kingdom only in Vortigern's time, so it is likely he was drawing upon territory that had previously come under Britain's central administration. This was part of his powerbase from which he was able to build his claim to the High Kingship of Britain.

Philip Barker's painstaking years of investigation at Caer Guricon (Urecon, Roman Viroconium, modern Wroxeter), which was the part-military, part-civil civitas (tribal capital) of the Cornovii, have revealed the construction well into the fifth century of a large and remarkable timber palace on quasi-Classical lines. Grandiose in conception, there existed a massive hall with a linear spread of outbuildings and even, perhaps, shops, all executed in timber. Once Pengwern had emerged as a separate kingdom at the end of the sixth century, this became its early capital.

Vortigern's main powerbase seems to have been further south than Powys, and his father may have had connections with Caer Gloui. Given the later divisions of towns in the area, Caer Baddan and Caer Ceri could have formed part of this territory. From the available evidence, it seems likely that, once Vortigern was defeated shortly after the civil war of the 440s, Ambrosius Aurelianus confirmed the rule of his sons over Powys, Builth and Gwent, and took the Gloucester region to form his own powerbase in southern Lloegr (England).  Is it possible that the territories of Caer Gloui, Caer Baddan and Caer Ceri all formed parts of one administrative region, or kingdom, in the mid-fifth century, and was passed onto Ambrosius' descendants, to be finally conquered by the West Saxons in 577? It seems highly likely.

Vorimorus, King of Dumnonia

The Celtic tribe of the Dumnonii ruled a large kingdom that covered the whole of the West Country from Somerset onwards and probably began to emerge as a distinct region by the beginning of the fourth century. It had become a fully independent kingdom by the fifth century, probably by 410. In this area, scarcely touched by Roman occupation, the Dumnonian leaders would have exercised a far higher level of self-rule than many areas of Britain.

As well as producing one of the earliest independent kingdoms, Dumnonia was one of the most stable until the West Saxon territorial gains of the late sixth century, neither changing its name or fragmenting in the way of most Celtic kingdoms. It produced a few sub-kingdoms, Glastenning, Cornubia and Lyonesse, which were ruled, in the same manner as Gwynedd, under Dumnonia's overall control, and were mostly later drawn back under direct rule. Glastenning was the only one not regained in whole, but this was due to Saxon conquests in the region.

In the remote south-west, the English Cornwall derives directly from its Romano-British label. Its Late British name, Cornouia, which was Latinised as Cornubia, has survived as Welsh Cerniw and Cornish Kernow (not to be confused with the Cernyw of Glywyssing). Cornubia seems to have constituted a pagus, a Roman subdivision, within the civitas of the Dumnonii, and later, as stated, a sub-kingdom for a time, before merging with Dumnonia as the latter was reduced by Saxon advances.

Flavia Caesariensis

Although the region as illustrated on the map existed as a late fourth century Roman civil administration province (borders conjectural), some older sources list its name as Britannia Secunda, and place Flavia Caesariensis as a very small province in the area of Carlisle in modern Cumbria.

By the late third century the whole south-east region was governed by the Comes Litoris Saxonici, Counts of the Saxon Shore, with an opposite number of equal rank controlling the north in the form of Dux Britanniarum, Duke of the Britons, the last of which was Coel Hen. The former was charged with guarding the entire east and south coast from the Humber to the Isle of Wight from increasingly frequent raids by Saxons and Irish Scotti.

Many of the defended areas were settled with Teutonic foederati, to strengthen native defences there. These forces might have been greatly increased after the barbarian raid of 408/409, when the Roman administration was expelled and the Britons had to look after their own defences, and they eventually led to the forming of the earliest Saxon and Anglian kingdoms in these regions.

It seems highly likely (although it is completely undocumented) that, if the south-eastern Roman provinces survived AD 409 and the change of ownership of Britain, they probably survived until the middle of the century, when over the course of a decade, the country was ravaged by foederati revolt, plague, civil war, Pictish incursion, and Jutish invasion.

Maxima Caesariensis

The Romans were familiar with the Celtic tribal divisions in the country, and they accommodated this habit in their own organisational divisions. Britain (England and Wales) is a relatively small country, but then as now is still too large and diverse to administer as a single entity.

Britannia Superior was created by the Romans in the third century to administratively separate the south of Britain from Britannia Inferior, the militarised north (Superior, "higher" and Inferior, "lower" in the sense of nearer to, and further from, Rome itself).

A century later, this administration zone was further divided to create Britannia Prima (Wales and the West Country), Flavia Caesariensis, and Maxima Caesariensis. Inis Vectis, or later Ynys Weith, would have come under the control of this region.

Ceint, while perhaps administratively still a part of Maxima Caesariensis in AD 409, seems to have become a petty kingdom by circa 425.

Further north, the marshes around The Wash seemed to have regained the ground they had lost under Roman administration. Second century Roman drainage work, which may have been poorly executed in the first place, was abandoned during the mid-fourth century economic slump and never repaired.

Images and text copyright © P L Kessler. An original feature for The History Files.