A Map of the British Isles, in 972, including the internal divisions of the Kingdom of Britain, the realm of Emrys ap Arthws, who arrogantly already calls himself Lord of all Britain, Argwyldd Prydain.
The Kingdom of Britain:
The Royal Demesne:
Composed out of the Kingdoms of Powys, Gwynedd and Deherubath, King Consantine consolidated them into the permanent property of the Briton Crown as part of the Constantinian Reforms, which also included making the crown hereditary to the elder son, with the division of land to the other sons abolished. While this understandably upset the lords of Wales, he dealt with them with ruthless manner during the wedding of his son, Arthws to the daughter of the King of Italy.
Morganwwg:
The properties of the House of Morganwwg, which accepted the rule of Constantine early on. They enjoy relative autonomy, compared to the Lords of Dobonnia or Durnovaria.
Dobonnia:
Or Dobounnia, is the frontier of the Kingdom of Britain. It saw a great flood of settlement and colonization after Constantine defeated the Mercians in 892 at the Battle of Oxnaford. The fertile plains beckon to Cymry farmers, and Constantine has begun a program of resettlement, offering land to Cymry noblemen and farmers. Yet, it still remains a hotspot of Viking raids, and Constantine had thus built a network of castles and hillforts to defend the region from Dane attacks. The current Tywysog of Dobonnia is Uthred ap Brochfael, a friend of Brenhin Emrys and a military genius besides.
The Disputed Lands:
This band of land east of Dobonnia and west of East Anglia is claimed by both Danes and Britons, and a new war has flared up from this dispute. Following Mercia's collapse after the Battle of Oxnaford killed off their remaining royal family, the Danes conquered this land, while the Britons attempted to complete their conquest of Mercia. Ultimately, this land went to the Danes, until in 972, when Brenhin Emrys has begun a new push to take it from the Danes.
Dumnonia:
This one is a curious melting pot. Anglo-Saxon, Cornish, Cymry and Norse all see their languages and cultures exchanged and influenced in this limbo of cultures. Reclaimed in 913 by Brenhin Arthws, it was first a property of the West Saxons, before being invaded by the Danes in 881. Its conquest has opened it up to Cymry colonization, but it saw little settlement compared to Dobonnia or Durnovaria. As of now, the Prince of Dumnonia is the restored Tywysog Uthred of Kernow.
Durnovaria:
Formed out of Brenhin Arthws conquests of Wessex, Durnovaria is the twin lordship to Dumnonia. As a rich, fertile land, it has seen great migration by Cymry farmers, although not to the degree of Dubonnia. The borders remain dangerous, as every so often Danish raids cross the hillforts and castles to try to take back Winchester from the Britons.
Rheged:
The most recent of additions to the Briton Kingdom. It is formed out of Emrys' slice of Northumbria during the Partition of Jorvik, the lion's share going to the King of Norway and Scotland. It is a haven of Cumbric culture, as the Cumbrians who can afford it travel south and Cymry settlers arrive in from Powys and Gwynedd, mixing with the local Anglo-Saxons and few Norse settlers.