History of Wigan   (Help with ancient and recent history.)

May I draw your attentions to the original question asked by Brian on the opening of this thread?

"What is the evidence that Wigan was once the Roman "Coccium"?

We all know that there was Roman occupation in Britain for over 400 years, and that the Romans built many roads and settlements, and that Wigan nowadays stands on one of the many sites where there once was Roman occupation.

But, WHERE is the evidence that it was called Coccium?