\'The myth of Celtic and Roman Britain\'

[Phaichtos]

Good points, Lorenzo. The only addendum I'd make is that (even today) there are many different "contact zones" between disparate cultures where it would have been a bit difficult to differentiate between the different groups. For instance, the material culture of the Rhineland around the time of Caesar is kind of a mix of what we would call "Germanic" and "Celtic" influences, and there even appears to be some confusion in the Classical sources on who was who. This points to a situation where there was a meshing of the populations and the individuals from the two different groups may have even had more in common with each other in a given region than with more distant populations of the same "ethnic group".