History Files


Celtic Kingdoms of the British Isles

Celts of Britain




MapDeywr / Deifr

MapDuring the withdrawal of Roman administration from Britain and for a century and-a-half afterwards, Deywr formed part of the territory that came to be known as the 'Kingdom of Northern Britain'. In effect this was the Late Roman province of Britannia Secunda, which encompassed all the land north of the Humber and south of Hadrian's Wall. Tradition, perhaps a little unreliably, says that it was governed by Coel Hen in the last days of the Roman period of the Diocese of the Britains and the first decade of independent British administration. After that it became an hereditary possession, and in the Celtic tradition it was slowly divided and sub-divided.

The region known as Deywr remained part of the kingdom of Ebrauc (it was apparently never a kingdom in its own right). This south-eastern section of Northern Britain was ruled from the Roman city of Eboracum, or Ebrauc to the Britons (modern York). Deywr's original territorial boundaries are probably mirrored in the modern county boundaries of East Yorkshire. It is likely that the region regarded Petuaria (modern Brough, possibly the tribal centre of the Parisi prior to Roman rule) as its local capital, until this lost its importance in the mid-fourth century, perhaps because the harbour had silted up. Thereafter, the region's main military post moved to Malton.

The origin of the name Deywr is obscure, with perhaps the simplest explanation being the Celtic word for oak, which was ''deru' or 'derwa'. The region was always known as a wooded region, so this would make sense. A reasonable (if not strong) alternative case can be made with the transformation of the Brythonic 'p'. The tribe of the Cantii in modern Kent seem to have spawned a colony which bore the name Decanti, meaning 'of or from the Cantii'. So also, it seems, a colony of the Parisi might have called themselves Deparis (or Deparisi with the Roman suffix attached). Given the universal Celtic habit of dropping sounds out of words, a transition from Deparis to Debar to Dever to Deywr is certainly plausible. A movement from 'p' to 'b' is known in northern Britain (mountains in Scotland are known as 'ben', not 'pen', both meaning 'head', but this must still be part of the Pictish language because a 'head' in Gaelic is 'ken', not 'ben'). Once a 'b' is present, a softening of the 'b' sound through 'v' to 'w' is almost automatic. So Deywr may have been a fifth century naming for a pre-Roman Parisi colony away from the central body of the tribe.

From at least the early fifth century laeti were hired and settled locally in order to protect the north eastern shoreline of Britain. These people were Angles, probably part of the general wave of barbarian 'Saxon' seaborne raiders who caused so much trouble in the fourth century around Britain's coastal waters. This particular group claimed descent from Waegdaeg's Folk (according to their later traditional pedigree). They were probably settled on the coast under their own leaders on lands allotted to them by their British paymasters at Ebrauc, and often within the structure of existing estates. In one version of the Anglian pedigree there is a note against the name of one Soemil to the effect that 'he first separated Deira from Bernicia'. A direct ancestor of King Edwin (612-632), Soemil could have been a prominent figure among the Yorkshire laeti in the fifth century. It looks as if he was remembered for the leading part he played in making his people independent (at least nominally) from the regional British authority.

FeatureIn 559 or 560, the long-lived king of Ebrauc died, and the Angles under their leader, Ælle, seem to have taken total control of Deywr with very little fuss. In their northern Teutonic tongue, they pronounced Deywr as Deira, and a new, and hostile, kingdom was formed on Britain's east coast.

(Additional information by Edward Dawson.)

c.420 - 559

Deywr is part of the territory belonging to the 'Kingdom of Northern Britain' which is governed from the former Roman city of Eboracum. Around this time, perhaps a decade or two after the expulsion of Roman administration from Britain, Anglian laeti are settled along the coast to serve in the defence of that same coastline against raiders, a standard practice throughout the late empire and in independent Britain subsequently. The leader of these laeti is possibly one Saebald, son of Sigegeat of Waegdaeg's Folk in Angeln, and ancestor of the later first Anglian king of Deira. The approximate date is calculated backwards from the first Deiran king, using the traditional pedigree.

The remains of the defensive bank at Roman Derventio (modern Malton) are shown here, which formed the main military post in the region of Deywr

fl c.420

Saebald / Sibald

Leader of the Anglian laeti upon their first arrival from Angeln?

fl c.440

Saefugul / Segulf / Saefugel


fl c.460

Soemel / Soemil / Saefugel (II)

Son. Assumed a level of independence for the Angles in Deywr?


While it is unknown just how the change from British Deywr to Anglian Deira progresses, Soemel is noted by the later royal pedigree as someone who 'separated Deira from Bernicia'. This clearly refers to Ebrauc rather than Bernaccia (still in British hands at this time), as it is only considerably later that Bernicia is Deira's main rival in the region. At the moment Ebrauc governs the whole south-east section of Northern Britain, and it seems to be Soemel who probably refuses to blindly obey orders and instead establishes negotiated terms of service, perhaps on a semi-independent basis. The time at which Britain is in confusion following the removal of Vortigern from office and the Jutish revolt in Ceint would be an ideal date for this event. It may also be the trigger for the settlement of Angles on the opposite, southern bank of the River Humber, the early Lindisware.

fl c.480

Uestorualcna / Sguerthing / Westerfalea

Son. Westerfalea means 'western falcon'.

There is also a Sguerthing who is king of the Geats, and probably a contemporary. Given that it is likely that Angles are in Deywr at this time, then there are either two leading figures with the same name at the same approximate time at either end of the North Sea, or Sguerthing and his descendants have not yet arrived to take control of the Angles in this region of Britain. Either is possible, although that would make these Anglian kings into Geats. A third option (perhaps the most favourable) is that the names simply become confused in oral tradition or later written form.


'Saxon' leader, led a massive alliance of Scots, Picts and Irish.

Colgrin is mentioned by Geoffrey of Monmouth as a 'Saxon' leader who leads a wide-ranging alliance against Arthur, high king of Britain, along with Badulf his brother and Duke Cheldric, a Saxon who brings a powerful force with him from Germany (probably Childeric I, king of the Salian Franks of Yssel at this time). Colgrin is actually an eleventh century Anglo-Norman name with Old Norse ancestry (see the Academy of Saint Gabriel Report 1338, Sources), making it a modern name in Geoffrey's terms.

Ultimately all three are killed in battle against Arthur as he successfully reclaims Britain from Saxon infiltration. Unfortunately, in reality, although Arthur is almost certainly able to stem the Germanic advance, he is not able to reclaim areas such as Kent and possibly Lindsey, while Deywr itself is apparently still a subject region of Ebrauc (although possibly semi-autonomous) with a large population of Angles who serve as laeti.

fl c.500

Uilgils / Giulglis / Wilgils


fl c.520

Uuscfrea / Ulfrea / Uxfrea / Usfrey


fl c.540

Yffi / Iffi / Yffe

Son. Father of Ælle.


FeatureThe Angle laeti who have probably been settled in areas of Deywr for up to a hundred and twenty years now take full control of the region, separating themselves entirely from Ebrauc's control. The circumstances are unknown, but under Ælle, the son of Yffi, the Angles found their own kingdom, corrupting Deywr into Deira.