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Post-Roman Britain

Southern Britain's Lost Kingdoms

by Peter Kessler, 1 April 1999. Updated 14 February 2007



Part 3: Lost Kingdoms

Some sub-Roman territories or kingdoms are better attested than others. Those in the south-west may not have survived longer than some of their eastern counterparts, but they seem to be mentioned more often.


Caer Gloui (with Caer Baddan and Caer Ceri)

To the south of Pengwern lay the Romano-British cities of Caer Gloui (Roman Glevum, modern Gloucester in Gloucestershire), Caer Ceri (Roman Corinum, modern Cirencester in Gloucestershire) and Caer Baddan (Roman Aquae Sulis, modern Bath in Somerset). The colonia of Gloucester was founded by Rome around the start of the second century.

It is known that small kingdoms existed here in the sixth century, although their names are not known. Ambrosius Aurelianus, strongly linked to the south west, also seems to be linked to Caer Gloui (and the 'three cities' territory), so perhaps this was his main base. It seems highly possible that the later splintered kingdoms were a single political entity in his time, and were subsequently handed out between descendants (Nennius calls the region Guenet).

In fact, the centre of Ambrosius' power in the mid- to late-fifth century can only lay in one of two places, and of those, Caer Celemion seems less likely. The three cities territory, lying in central Wiltshire, west of the hinterland of the Saxon Shore, and extending from upper Somerset to Gloucester was an area not yet remotely threatened by Cerdic and his people in Hampshire.

And here, strategically situated in the Avon valley, almost due south of the central section of East Wansdyke at Wodnesgeat, some fourteen miles away across the Vale of Pewsey, is Amesbury, which in a charter of about 880 was spelt Ambresbyrig, 'the stronghold of Ambrosius'. Nowhere could be better suited to be the focus of Ambrosius' operations.

According to archaeological evidence, Caer Ceri continued as a centre for civic life in the 440s; the defences were repaired, flood prevention work was carried out on one of the gates, and the piazza of the forum was kept clean. But in 443 the whole Roman world was swept by a plague, the severity of which has been compared to the Black Death, and this hit Britain around 446. At the same time as the Anglo-Saxon mercenaries in the east revolted, unburied bodies were to be found in Caer Ceri's streets, and the town seems to have contracted to some small wooden huts inside the amphitheatre.

The Romano-British must have recovered from the mid-century plague. The next major event for the territory was Ælle's attack on Mons Badonicus in circa 496. The route the Saxon forces took was probably westwards along the upper Thames Valley and through the Goring Gap.

Part 1: Intro
Part 2: Cynwidion & Pengwern
Part 3: Gloui, Dumnonia, & Ceint
Part 4: Celemion & Colun
Part 5: Gwinntguic, Lerion, Lundein, & Went
Part 6: Linnius, Rhegin, & Weith
Part 7: Lost Kings

It seems creditable to assume that the north-facing Wansdyke, constructed in the fifth or sixth centuries (and which roughly follows in part the proposed upper section of Caer Baddan's eastern border where it leads to the northwestern border of Caer Celemion), was put up by sub-Roman forces in Wiltshire in the face of just such a threat.

It could either have been constructed to ward off this very attack from the direction of the Thames Valley (and perhaps channel the attackers towards Badon), or in response to it, to ensure that no future attacks of this nature could take place. In that it was very effective, until the West Seaxe conquered the heart of Wiltshire in 552.

No doubt greatly heartened by their victory at the end of the century, the sub-Roman presence continued to hold out. For much of the early sixth century (at least until 534, and maybe as late as 560) they remained in general unmolested.

In 577, the West Saxons set great store by the fact that the final kings of the three cities were killed fighting them at the Battle of Dyrham (Gloucestershire). The territory was taken over by the Hwicce, who apparently merged with the existing Briton population. The West Wansdyke region of Caer Baddan seems to have remained in Dumnonian hands (or those of Glastenning) until 597-611, when it fell to the West Seaxe.


The Roman city of Bath

Typical Roman baths, with this computer-generated image being of those at Bath itself (click or tap on image to read more on a separate page)

Eastern Dumnonia

On Britain's south coast, the modern Dorset area remained in British hands until at least the mid-seventh century.

Given the dominance of Dumnonia over the whole of the south west, it is unlikely there was an independent kingdom here, but either Caer Durnac (Roman Durnovaria, Dorchester in Dorset - from the former Durotriges tribe of this territory) or Wareham (the site of several early British memorial stones) may have hosted a regional power base, or sub-kingdom.

Its name is unknown but extrapolating from Dorset's modern name, and the fact that Saxon settlers in the area called themselves the Dornsaete, the name Dorotric, or Dortrig, is not impossible. Defnas (Devon) has also been used for the neighbouring area to the west, probably to indicate the Britons there.


Ceint (Cantiacum / Kent)

Nothing outside of the traditional story of Vortigern's betrayal by his Jutish foederati is known of post-Roman Kent. It cannot have remained a free territory for more than a generation before being captured by Hengist and Horsa between 450-455.

They were given land there in 450, and began their revolt later the same year. But Ceint was definitely a British kingdom in 450, and may have been established by the time Vortigern became high king around 425. Its capital would have been Durovernum (Canterbury).

The story of its capture ascribed a King Gwyrangon as its ruler. Doubtless he became one of Vortigern's staunchest detractors when he found the High King had given his kingdom away to barbarians, but he must have put up a fight. The Anglo-Saxon Chronicle depicts two major battles, Agæles threp (Aylesford in Kent) in 455 and Crecganford (Crayford) in 456, before the British are said to have given up on Ceint and retreated to London.

One further defeat sealed Kent's fate.



Text copyright © P L Kessler, from various notes and sources. An original feature for the History Files.