(The), or The Kelts. This family of nations includes the Irish, Erse, Manx, Welsh, Cornish, and Low Bretons. According to historic fable, Celtina was the daughter of Britannus. She had a son by Hercules, named Celtus, the progenitor of the Celts.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894