The findings of Graham Robb, a biographer and historian, bring into question two millennia of thinking about Iron Age Britain and Europe and the stereotyped image of Celts as barbarous, superstitious tribes... "They had their own road system on which the Romans later based theirs," Mr Robb said, adding that the roads were built in Britain from around the 1st Century BC. "It has often been wondered how the Romans managed to build the Fosse Way, which goes from Exeter to Lincoln. They must have known what the finishing point would be, but they didn't conquer that part of Britain...