Britannia Prima

Roman Britain around AD 410, without speculative provincial borders.

Britannia Prima or Britannia I (Latin for "First Britain") was one of the provinces of the Diocese of "the Britains" created during the Diocletian Reforms at the end of the 3rd century.[1] It was probably created after the defeat of the usurper Allectus by Constantius Chlorus in AD 296 and was mentioned in the c. 312 Verona List of the Roman provinces. Its position and capital remain uncertain, although it was probably located closer to Rome than Britannia II. At present, most scholars place Britannia I in Wales, Cornwall, and the lands connecting them. On the basis of a recovered inscription, its capital is now usually placed at Corinium of the Dobunni (Cirencester) but some emendations of the list of bishops attending the 315 Council of Arles would place a provincial capital in Isca (Caerleon) or Deva (Chester), which were known legionary bases.


The traditional arrangement of the late Roman provinces after Camden,[2] placing Prima along England's southern coast. On the basis of modern archaeology, the province at least reached as far north as Corinium.
Another possible arrangement of the late Roman provinces, with Prima in Wales and Cornwall
  1. ^ Frere, Sheppard (1967). Britannia: a history of Roman Britain. Cambridge: Harvard University Press. pp. 198–199.
  2. ^ Camden, William (1610) [Original text published 1586], "The Division of Britaine", Britain, or, a Chorographicall Description of the most flourishing Kingdomes, England, Scotland, and Ireland, translated by Philemon Holland

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