Isca Dumnoniorum but seems to have gone into decline prior to the Roman withdrawal from Britain . The name "Isca Dumnoniorum" is a Latinization of a native Brittonic name describing flowing water, in reference to the River Exe. More exactly, the name seems to have originally meant "full of fish" (cf. Welsh "pysg", "fish"), although it came to be a simple synonym for water (cf. Scottish whiskey). This is also reflected in the modern Welsh name for Exeter: "Caerwysg" meaning "fortified settlement on the river Uisc". The same name was used for the River Usk (modern ) in southern Wales, causing the
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