One of the reasons is political interference upon the French historical interpretation
during the 19th century. French historians adopted fully the explanation of Caesar who
stated that Gaul stretched from the Pyrenees up to the Rhine in the north. This fitted the
French expansionist aspirations of the time under Napoleon III of France. In the north of
(modern) France, the Gaul-German language border was situated somewhere between the
Seine and the River Somme. Northern Belgic tribes like the Nervians, Atrebates or
Morini appear to be Germanic tribes who migrated from the Germanic hinterland and
adopted Celtic language and customs[citation needed], as all of the names of their leaders and
towns are Celtic. In addition to the Gauls, there were other peoples living in Gaul, such as
the Greeks and Phoenicians who had established outposts such as Massilia (present-day
Marseille) along the Mediterranean coast. Also, along the southeastern Mediterranean
coast, the Ligures had merged with the Celts to form a Celto-Ligurian culture.
In the second century BC, Mediterranean Gaul had an extensive urban fabric and was
prosperous, while the heavily forested northern Gaul had almost no cities outside of
fortified compounds (or oppida) used in times of war. The prosperity of Mediterranean
Gaul encouraged Rome to respond to pleas for assistance from the inhabitants of
Massilia, who were under attack by a coalition of Ligures and Gauls. The Romans
intervened in Gaul in 125 BC, and by 121 BC they had conquered the Mediterranean
region called Provincia (later named Gallia Narbonensis). This conquest upset the
ascendancy of the Gaulish Arverni tribe.
[edit] Conquest by Rome
Main article: Gallic Wars
The Roman proconsul and general Julius Caesar pushed his army into Gaul in 58BC, on
the pretext of assisting Rome's Gaullist allies against the migrating Helvetii. With the
help of various Gallic tribes (for example, the Aedui) he managed to conquer nearly all of
Gaul. But the Arverni tribe, under Chieftain Vercingetorix, still defied Roman rule. Julius
Caesar was checked by Vercingetorix at a siege of Gergorvia, a fortified town in the
center of Gaul. Caesar's alliances with many Gallic tribes broke. Even the Aedui, their
most faithful supporters, threw in their lot with the Arverni. Caesar captured
Vercingetorix in the Battle of Alesia, which ended Gallic resistance to Rome.