Here is a geographic overview of the Ebrauc faction.
The Kingdom of Ebrauc was centred on the old Roman city of Eboracum which was once the capital of the province of Britannia Inferior and the place Emperor Constantine the Great was proclaimed. However, by the time of our mod in 449 the Kingdom of Ebrauc is in disarray, its walls are unmaintained...its economy has collapsed and the egg has replaced the worm as the lowest form of currency...
Nevertheless, on the bright side King Ceneu is on the throne and there are high hopes he will sort things out...but he'd better keep an eye on the Angles though...
Settlements and Regions
Caer Ebrauc (Modern name: York)
According to legend the city of Caer Ebrauc was founded in pre-Roman times by a King Ebrauc who had twenty wives and fifty daughters. The name of the post-Roman city of "Ebrauc" (or a version of it) is revealed to us in the Historia Brittonum (History of the Britons) by Nennius written c.820...
Ebrauc is the capital of the kingdom and lies in the region of Deivyr."Ida was the son of Eoppa [and] he of the Saxon* race was the first king in Bernach, and in Cair Affrauc." - Historia Britonnum, Nennius
Ebrauc fell to the Northumbrian Angles of "Deira" in 580...perhaps you can do better?"Five battalions fell before his blades; even of the men of Deivyr, uttering groans, twenty hundred perished in one short hour." - Y Gododdin
Caer Ebrauc (surviving Roman ruins)
Dwrwyn (Modern name: Malton, North Yorkshire)
This is a Brythonic town on the River Derwent. In Roman times it was called Derventio in Latin. The Brythonic name means "white water". Dwrwyn is in the coastal Mordei region.
Catreath (Modern name: Catterick)"He subdued the Mordei that owed him homage." - Y Gododdin
In Roman times this place was called Cataractonium but it's real name is "Catreath" meaning “the war tract” (cad-traeth) on account of a ditch thereabouts marking the frontier between ancient tribal territories. In the Mod, Catreath is the capital of Argoed region. Argoed means "next to the forest" and is described in Y Gododdinas an area bordering on Deivyr and Bryneich.
Caerdunod (Modern name: High Bentham, Yorkshire)“The men of Argoed have ever supported me.” - Canu Llywarch Hen
Caerdunod is the capital of the Pennine sub-kingdom of Dunaut. This region was a semi-independent realm ruled by illustrious men such as Pabo Post Prydain (Pabo Pillar of Britain), his son Dunod Fawr (after whom the area are named) and his son Sawyl Penuchel (Saul High-Head) a man listed as one of the "Three Arrogant Men of the Island of Britain" in the Welsh Triads.
Caerweir (Modern name: Durham)
Caerweir is a great fortress on the River Wear. The writer Bernard Cornwell went into much detail about this fortress in his "The Last Kingdom" series of books set in Anglo-Saxon England. It is in the region of Carnoban.
CaerweirAnd there remained none of the Loegrians that did not become Saxons, except those that are found in Cornwall, and the commot of Carnoban in Deria and Bernicia. - Red Book of Hergest
Loidis (Modern name: Leeds)
Loidis was the main settlement in the sub-kingdom (and region) of Elmet. Elmet was eventually conquered by the Angles in 626.
*The Welsh usually called all the different Germanic tribes "Saxon" (Welsh: Saes). It is rather like the word 'Latino' not differentiating between Puerto Ricans and Cubans.