Britannia

• Kingdoms
• 

  Kingdom of Ceredigion

• 

  Kingdom of Deheubarth

• 

  Kingdom of England

• 

  Kingdom of Galloway

• 

  Kingdom of Gwent

• 

  Kingdom of Gwynedd

• 

  Kingdom of the Isles

• 

  Kingdom of Mann

• 

  Kingdom of Morgannwg

• 

  Kingdom of Powys

• 

  Kingdom of Scotland

• 

  Kingdom of Great Britain

• 

  United Kingdom of Great Britain and Ireland

• Petty Kingdoms
• 

  Kingdom of East Anglia

• 

  Kingdom of Essex

• 

  Kingdom of Kent

• 

  Kingdom of Mercia

• 

  Kingdom of Northumbria

• 

  Kingdom of Sussex

• 

  Kingdom of Wessex

• Principalities
• 

  Principality of Maelienydd

• 

  Principality of Powys Fadog

• 

  Principality of Powys Wenwynwyn

• 

  Principality of Wales

• Lordships
• 

  Lordship of Arwystli

• 

  Lordship of Croesallgwn

• 

  Lordship of the Isles

• Republics
• 

  Commonwealth of England