Dumnonii the origin of the interpretation of Dumnonii as "deep valley dwellers" from his understanding of the Welsh of his time. John Rhys later theorized that the tribal name was derived from the name of a goddess, "Domnu", probably meaning "the goddess of the deep". The proto-Celtic root *dubno- or *dumno- meaning "the deep" or "the earth" (or alternatively meaning "dark" or "gloomy") appears in personal names such as Dumnorix and Dubnovellaunus. Another group with a similar name but with no known links were the Fir Domnann of Connacht. The Roman name of the town of Exeter, "Isca Dumnoniorum" ("Isca of
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.