Thorverton River Exe (near to the current day bridge), a key crossing for the military garrisoned at Exeter (Isca Dumnoniorum). There is no evidence however to suggest that there was a settlement here by the time of the Domesday Book in 1086, although Thorverton Mill was running at this time on the River Exe (and continued to do so until its closure in 1979). (Raddon, a hamlet W of Thorverton is mentioned in the Domesday book. "William holds RADDON (in Thorverton) from the abbott. Wulfmaer held it in TRE, and it paid geld for 1 virgate of land. There is land
Isca Augusta River Usk. The suffix "Augusta" appears in the Ravenna Cosmography and was an honorific title taken from the legion stationed there. The place is commonly referred to as "Isca Silurum" to differentiate it from Isca Dumnoniorum and because it lay in the territory of the Silures tribe. However, there is no evidence that this form was used in Roman times. The later name, "Caerleon", is derived from the Welsh for "fortress of the legion". Isca was founded in AD 74 or 75 during the final campaigns by Governor Sextus Julius Frontinus against the fierce native tribes of western Britain, notably