States in Medieval Britain

The following counties are listed in the Domesday book, compiled under the order of William the Conqueror between 1066 and 1086,

• Bedfordshire
• Berkshire
• Buckinghamshire
• Cambridgeshire
• Cheshire
• Cornwall
• Derbyshire
• Devon
• Dorsetshire
• Essex
• Gloucestershire
• Hampshire
• Herefordshire
• Hertfordshire
• Huntingdonshire
• Kent
• Lancashire
• Leicestershire
• Lincolnshire
• Middlesex
• Nottinghamshire
• Norfolk
• Northants
• Oxfordshire
• Rutland
• Shropshire
• Somerset
• Staffordshire
• Suffolk
• Surrey
• Sussex
• Warwickshire
• Worcestershire
• Wiltshire

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Here follow (mostly) states prior to 1066
on this there is some discussion in the Talk-section:
"What are the middle ages?"

Angle, Saxon, & Jute states

• East Anglia
  • Norfolk
  • Suffolk
• Hwicce
• Essex
• Kent
• Lindsey
• Magonsaetan[?]
• Mercia
• Northumbria
  • Bernicia
  • Deira
• Sussex
• Wessex

Southern Celtic states

• Afan
• Arfon[?]
• Arllechwedd[?]
• Brycheiniog[?] (Brecon)
• Buellt[?] (Builth)
• Calchvynydd[?]
• Camelot = fictional
• Cornwall
• Deheubarth[?]
• Demetae[?]
• Devon
• Dunoding[?]
• Dyfed
• Dyffryn Clwyd[?]
• Elfael[?]
• Erging[?]
• Glyn Rhondda[?]
• Glywysing[?]
• Gwerthrynion[?]
• Gwynedd
• Gwynlliauc[?]
• Gwynllwg[?]
• Gwyr
• Powys
• Gwent
• Llyn[?]
• Manaw Gododdin[?]
• Meirionydd[?] (Merioneth)
• Meisgyn[?] (Miskin)
• Melenydd[?]
• Mon
• Morgannwg (Glamorgan)
• Pennines
• Penychen[?]
• Rheged
• Seisyllwg[?] (Ceredigion)
• Senghenydd[?]
• Tegeingl[?]
• Ystrad Tywi[?]

Scottish, Pict & Caledonian states

• Scotland
• Strathclyde
• Lothian
• Cumbria
• Dalriada
• Galloway[?]
• some concoction of rugged islands[?]
• Alban
• Moray
• Caithness[?]
• Mar[?]
• Argyll[?]
• Fortriu[?]

Dane, Norsemen & Dubliner states

• Danelaw
• Gaell-Gaedhill[?] (Galloway)
• Yorkshire
• Earldom of Orkney[?]
• Kingdom of Man[?]
• Cumbria