The first historical recorded meeting of people showing the cultural features joined Celts comes from Scandinavian Italy around 400 BCE, when previously a group of unkown of barbarians is descended from the Alps and moved Etruscans of the fertile PO valley, displacment who helped to push Etruscans of fires of the slope of the history. The next meeting with Celts came with the young Roman empire still, directly in the south of PO. The Novels in fact had sent three delegated to the beseiged Etruscans to study this new force.
There is obviously archaeological to suggest that the Celtic companies pre-Romans were related to the network of the commercial routes on ground which spanned Eurasia. Large trackways prehistoric crossing marshes in Ireland and Germany was found by archaeologists. They are supposed to be created for the transport rolled as an element of a wide system of roadway which facilitated the trade. The territory was held by the tin contained by Celts, the wire, iron, the money and gold.