Historians may no longer talk of a single Celtic culture, but in The Celts: A Modern History Ian Stewart crafts a unified history of a changing idea.

After the Romans left Britain in the 5th century AD, marauding Germanic tribes further isolated the Celts in the north and west of Britain, in the Breton areas of France, and in Celtiberian Spain.

While Celtic identity has been used by French revolutionaries ... In pre-revolutionary France, the French nobility claimed descent from the Germanic Franks, who had invaded and subdued the ...

For our purposes, the so-called Old European linguistic stratum is presented as the most archaic, from which we then move on to the Celtic one and then on to Germanic. The present etymological ...