Nennius’ Historia Brittonum

The History of the Britons or Historia Brittonum is a purported history of the indigenous British people that was written around 828 and survives in numerous revision’s that date from after the 11th century. The Historia Brittonum is commonly attributed to Nennius. It contains a miscellaneous collection of historical and topographical information including a description of the inhabitants and invaders of Britain and providing the earliest-known reference to the British king Arthur and a list of 33 British Towns.

I Cair Hebrauc York (Eburacum).
II Cair Ceint Canterbury (Durovernum Cantiacorum) Ceint, Anglesey.
III Cair Gurcoc f. Ceirchiogg, Anglesey.
IV Cair Guorthegern f. Gwitheryn, Denbighshire.
V Cair Gusteint f. Llan-Gustenin, Caernarvonshire.
VI Cair Guoranegon Worcester (Vertis) Warrington, Cheshire.
VII Cair Segeint Silchester, Hampshire (Calleva Atrebatum) Caernarfon, Gwynedd (Segont[ium]); Caernarfon ‘The fort at the river-mouth’. From Welsh caer + an + arfon.
VIII Cair Guin-truis Norwich, Norfolk; Gwynnys, Cardiganshire.
IX Cair Merdin Carmarthen, Dyfed (Moridunum Demetarum); Caermarthen Possibly ‘The fortress of Merlin’ from Welsh caer + pers-name *Myrddin; or (more likely) from a contraction of the Romano-British name Moridunum, which itself may mean ‘the hillfort of decay’, from Latin mori + Celtic dunum; or ‘the hillfort of a man called *Merdi’.
X Cair Peris f. Llan-Peris, Caernarvonshire; Portchester, Hampshire (Portus Ardaoni)
XI Cair Lion Caerleon, Monmouthshire (Isca Silurum / Castra Legionis); Caerleon ‘The fortress of the Legion’. From Welsh caer + Latin Legionis. The original name, Isca Silurum is Romano-British for ‘the waterside place of the Silures tribe’, derived from the Welsh/Gaelic word uisg / usk ‘water’ and the name of the local Celtic tribe the Silures.
XII Cair Mencipit f. Mansell, Herefordshire; St. Albans, Hertfordshire (Verulamium)
XIII Cair Caratauc f. Carrog, or Carroc, Cardiganshire; Catterick, Yorkshire (Cataractonium); Caer Caradoc, Knighton, Shropshire; Caer Caradoc, Church Stretton, Shropshire.
XIV Cair Ceri f. Kerry, Montgomeryshire; Cirencester, Gloucestershire (Corinium Dobunnorum)
XV Cair Gloui Gloucester (Glevum) St. Gluvias, Cornwall.
XVI Cair Luilid Carlisle, Cumbria (Luguvalium)
XVII Cair Graunt Grantchester, nr. Cambridge (Duroliponte)
XVIII Cair Daun Doncaster, Yorkshire (Danum)
XIX Cair Britoc Bristol, Avon; St. Colan, Cornwall.
XX Cair Meguaid Meivod, Montgomeryshire.
XXI Cair Mauiguid Menigid, Anglesey; Mwynglawd, Denbighshire; Manchester (Mamucium)
XXII Cair Ligion Chester, Cheshire (Deva / Castra Legionis); Llan-ligan, Montgomeryshire.
XXIII Cair Guent Caerwent, Monmouthshire (Venta Silurum)
XXIV Cair Collon Colchester, Essex (Camulodunum); St. Colan, Cornwall.
XXV Cair Londein London (Londinium)
XXVI Cair Guorcon f. Warren, or Woran, Pembrokeshire.
XXVII Cair Lerion Leicester (Ratae Coritanorum)
XXVIII Cair Drait-hou Drayton, Shropshire.
XXIX Cair Pensavelcoit Pen-Selwood, nr. Ilchester, Somerset (Lindinis); Pevensey, East Sussex (Anderitum).
XXX Cair Teun Teyn-Grace, Devon.
XXXI Cair Urnahc f. Llan-Fernach, Pembroke. Wroxeter, Shropshire (Uricon / Viroconium Cornoviorum).
XXXII Cair Celemion f. Kilmaen-Llwyd, Pembroke; South Cadbury, Somerset (‘Camelot’).
XXXIII Cair Loit-coit Ludlow; Lytchett, Dorsetshire; Wall, Nr. Lichfield, Staffordshire (Letocetum); Lincoln.

The Saxon Chronicle – A.D.1 to A.D.1154 trans. by Reverend J. Ingram (Longman, 1823);
Full text can be found

Roman Sites to visit in South East England