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The Britons or Brythons were the Brythonic-Celtic-speaking people of what is now England, Wales and southern Scotland, whose ethnic identity is today maintained by the Welsh, Cornish and Bretons.
The theme of Maponos son of Matrona (literally, child of mother) and the development of names in the Mabinogi from Common Brythonic and Gaulish theonyms has been examined by Hamp (1999), Lambert (1979), and Meid (1991).
The town's name is recorded in its earliest form as Mailros, 'the bare peninsula' (Old Welsh or Brythonic), referring to the original site of the monastery, recorded by the Venerable Bede, in a bend of the river Tweed.
He argued that the Brythonic languages originated in Gaul (France), and that the Goidelic languages originated in the Iberian Peninsula.
Kenneth H. Jackson (1909–1991), linguist specializing in the Brythonic languages