Dumnonia
Dumnonia (Ancient Greek: Δαμνόνιον, romanized: Damnónion, in the adjective form), a Latinised name, was a Brythonic kingdom that existed in Sub-Roman Britain between the 6th century CE and the 7th century CE in the more westerly parts of present-day South West England. Its predecessor, the pre-Roman Dumnonii territory, was centred in the area of modern Devon, but also included modern Cornwall and part of Somerset; its eastern boundary was moved westward over time with the gradual expansion of the neighbouring Anglo-Saxon kingdom of Wessex.