names before Isca Dumnoniorum (which is listed as scadum namorum, showing some of the problems of this source) and which have therefore been assumed to be west of Exeter. Several have been identified as most likely in Devon, leaving purocoronavis (the source of the name Cornovii (Kournaovioi), as discussed above), and a few others that are so corrupt as to defy identification, such as Giano, Pilais and Vernalis, which may possibly refer to places within the lands occupied by the Cornovii. Language The pre-Roman inhabitants were speakers of a Celtic language that would later develop into the Brythonic language Cornish. See also List of ancient Celtic peoples and tribes References Sources Further reading The History Files: Post-Roman Celtic Kingdoms: Cornubia (Cerniw) History of Cornwall Celtic Britons Military history of Cornwall Historical Celtic peoples