Former countries in the British Isles

historic kingdom on the British Isles (927–1649; 1660–1707)

historic sovereign kingdom on the British Isles from the 9th century and up to 1707

Britain under Roman rule (43 AD - c.410 AD)

historic republic on the British Isles (1649–1660)

Gaelic overkingdom that included parts of western Scotland and northeastern Ulster in Ireland

former Saxon kingdom on the island of Britain

Anglo-Saxon kingdom in southeast Britain

former collection of states in north-western Europe during the High Middle Ages

Deira ( ; Old Welsh/ or ; or ) was an area of Post-Roman Britain, and a later Anglian kingdom.

medieval kingdom in northern Britain

medieval kingdom in Scotland

Dumnonia (, in the adjective form), a Latinised name, was a Brythonic kingdom that existed in Sub-Roman Britain between the 6th century CE and the 7th century CE in the more westerly parts of present-day South West England.

state

The Gododdin () were a Brittonic people of north-eastern Britannia, the area known as the Hen Ogledd or Old North (modern south-east Scotland and north-east England), in the sub-Roman period. Descendants of the Votadini, they are best known as the subject of the 6th-century Welsh poem Y Gododdin, which memorialises the Battle of Catraeth and is attributed to Aneirin.

thumb|The River Eden, Cumbria|Eden Valley is thought by some to have been the heartland of the kingdom of Rheged. Rheged () was one of the kingdoms of the ('Old North'), the Brittonic-speaking region of what is now Northern England and southern Scotland, during the post-Roman era and Early Middle Ages. It is recorded in several poetic and bardic sources, although its borders are not described in any of them. Archaeological work from 2012 onwards on a site in Galloway in Scotland is interpreted by the excavators as showing that it is a royal centre of Rheged. Rheged possibly extended into Lanca

Elmet (), sometimes Elmed or Elmete, was a Brythonic kingdom thought to have been an independent polity between the 4th century and sometime after the mid-7th century as part of the Hen Ogledd.

thumb|right|Approximate location of Fortriu Fortriu (; ; ; ) was a Pictish kingdom recorded between the 4th and 10th centuries. It was traditionally believed to be located in and around Strathearn in central Scotland, but is more likely to have been based in the north, in the Moray and Easter Ross area. Fortriu is a term used by historians as it is not known what name its people used to refer to their polity. Historians also sometimes use the name synonymously with Pictland in general.

official status of the Orkney Islands

Calchfynydd (Welsh calch "lime" + mynydd "mountain") was an obscure Britonnic kingdom or sub-kingdom of sub-Roman Britain. Its exact location is uncertain, although the name suggests somewhere in one of Great Britain's Chalk Groups and might refer to southern Scotland, the Cotswolds, or the Chilterns. Virtually nothing else definitive is known about it.

Pictish kingdom during the Dark Ages

medieval Pictish kingdom in Scotland

thumb|The approximate location of Circin in Scotland.

Wikimedia list article

post-Roman kingdom in Great Britain