Scholars can’t agree on many of the facts of Celtic history. According to some, what we now call Celtic culture dates back to 1200 BC. Interestingly, this culture developed outside of the areas we now regard as the Celtic nations, in a broad band that stretches from modern eastern France to Hungary and Slovakia.
Over the next few centuries Celtic culture spread east to Romania (with an enclave in central Turkey), west to the Atlantic coast, down to the Iberian peninsula and up into Britain and Ireland.
With the expansion of the Roman empire, Celtic culture largely disappeared from its central European birthplace. The Celts were now restricted to Ireland, Wales, Scotland, Cornwall, the Isle of Man and Brittany. The culture lives on in these areas, most notably in the languages – Irish, Scottish Gaelic, Welsh, Breton, Manx and Cornish.
All of this is confused further by the fact that the word Celt is only a fairly recent invention, dating from the 18th century.