Britannia Prima or Britannia I was one of the provinces of the Diocese of the Britains created during the Diocletian Reforms at the end of the 3rd century. It was probably created after the defeat of
Roman Britain around AD 410, without speculative provincial borders.
The traditional arrangement of the late Roman provinces after Camden, placing Prima along England's southern coast. On the basis of modern archaeology, the province at least reached as far north as Corinium.
Inscription of Lucius Septimius
Corinium Dobunnorum was the Romano-British settlement at Cirencester in the present-day English county of Gloucestershire. Its 2nd-century walls enclosed the second-largest area of a city in Roman Bri
Britannia Prima
…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…
A Roman mosaic in the Corinium Museum in Cirencester
Three Goddesses or Matres. Roman high relief sculpture, Corinium Museum, Cirencester
The Roman amphitheatre at Corinium Dobunnorum