I noticed on the maps seeing the term Celt and Gaul. Why are we using a combination of what the Celts called themselves and what the Roman called them? "who in their own language are called Celts, in ours Gauls" Julius Caesar source: http://realhistoryww.com/world_history/ancient/Etruria_the_Etruscans_2a.htm
The La Tene core is located roughly where the Germanic culture crosses with the Celtic cultures. The Treveri who claim Germanic origins (according to Tacitus) and are located in the center La Tene core circle that extends across the Rhine. The core territory of the La Tène culture (450 BC) is shown in solid green, the eventual area of La Tène influence by 50 BC in light green.