Dumnonia until they submitted to the See of Canterbury in the mid-9th century. Parish organisation was a later development of fully Normanised times. Around AD 55, the Romans established a legionary fortress at "Isca Dumnoniorum", modern Exeter, but west of Exeter the area remained largely un-Romanized. Most of Dumnonia is notable for its lack of a villa system, though there were substantial numbers south of Bath and around Ilchester, and for its many settlements that have survived from the Romano-British period. As in other Brythonic areas, Iron Age hillforts, such as Hembury and Cadbury Castle, were refortified in post-Roman times for
National Roman Legion Museum National Roman Legion Museum The National Roman Legion Museum () is a museum in Caerleon, near Newport, south-east Wales. It is one of three Roman sites in Caerleon, along with the Baths museum and the open-air ruins of the amphitheatre and barracks. It is part of the wider network of Amgueddfa Cymru – National Museum Wales. Roman Wales was the farthest point west that the Roman Empire in Roman Britain extended to, and as a defence point the fortress at Isca Augusta, now Caerleon, built in 75 AD, was one of only three permanent Roman Legionary fortresses in Roman Britain.