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390 BCE: "Gallic Catastrophe:" Brennus of the Senones defeats the Romans at Allia, and subsequently sacks Rome.
223 BCE: Romans successfully campaign against Celtic tribes of Cisalpine Gaul.
222 BCE: Rome conquers Cisalpine Gaul (modern-day Provence, France).
121 BCE: Gallia Narbonensis becomes a Roman province.
58 BCE - 51 BCE: Julius Caesar's conquest of Gaul.
58 BCE: Julius Caesar invades Gaul. Roman influence on the European tribes begins in earnest.
57 BCE: A Roman army under Caesar narrowly defeats an army of Nervii, Atrebates, and Viromandui.
53 BCE: Julius Caesar holds council of Gallic tribes in Lutetia.
52 BCE: Julius Caesar is defeated at Gergovia by Vercingetorix.
52 BCE: After becoming trapped and besieged at Alesia, Vercingetorix surrenders to Caesar.
51 BCE: Caesar's siege and capture of Uxellodunum ends the Gallic War.
44 BCE: The Allobroges unsuccessfully rise against Roman rule in southern Gaul.
33 BCE: The Belgic Morini and the Celts of Aquitania unsuccessfully rise against Roman rule.
256 CE: King Chrocus of the Alemanni invades Gaul and destroys the region.
406 CE - 420 CE: Vandals cross the Rhine and invade Gaul, migrate to Spain.
406 CE: Hun invasions force Vandals cross the Rhine into Gaul.
451 CE: Hun invasion of Gaul; Battle of the Cataluanian Plains (Battle of Chalons).
486 CE: Clovis of the Franks defeats the Romans in Gaul. Founding of the Frankish kingdom.