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 It was occupied and operational for just over 200 years. The National Roman Legion Museum lies inside what remains of the fortress, and contains many artefacts from the period of Isca Augusta of Legio II Augusta from Roman currency to uniforms. A short walk from the National Roman Legion Museum is the remains of Isca Augusta: "See: main articles Isca Augusta and Caerleon". The museum is located in the centre of Roman Isca, on what was the "via principalis" leading to the amphitheatre. The first museum building was the Antiquarian Museum of 1850. This was built to a design by