Which English county is part of the Celtic Congress?
Correct answer: Cornwall

DkRatz72
Tom, player #53553731 feels necessary to comment on any question he/she answers regardless of content or validity...

Tom
Player #53553731, no there was at least one earlier: the beaker people.
There are many indications of earlier people, stone henge was not Celtic.
The Celts were invaders. Not just the British Isles, but all over Europe.