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600 BCE: Phocaea founds the colony of Massilia.
400 BCE - 300 BCE: Founding of Lutetia.
390 BCE: The Senone Tribe of Gaul sack Rome; Camillus mobilizes forces to defeat them and save the city. Hailed as "Second Romulus". .
390 BCE: Gauls sack Rome.
390 BCE: "Gallic Catastrophe:" Brennus of the Senones defeats the Romans at Allia, and subsequently sacks Rome.
334 BCE: Rome signs a peace treaty with the Senones tribe.
284 BCE: Gauls of the Insubres and Boii tribes defeat the Romans at Arretium.
283 BCE: Rome decisively defeats the Senones at Picenum.
279 BCE: Gauls attack the sanctuary of Delphi.
223 BCE: Romans successfully campaign against Celtic tribes of Cisalpine Gaul.
222 BCE: Rome conquers Cisalpine Gaul (modern-day Provence, France).
203 BCE: Carthaginian commander Mago is unable to join forces with Hannibal and his army is defeated in Cisalpine Gaul.
121 BCE: Gallia Narbonensis becomes a Roman province.
58 BCE: Caesar attacks the Helvetii while on migration and defeats them.
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.
56 BCE: The navies of Rome and the Veneti Gauls clash resulting in a Roman victory. This is the first recorded naval battle in the Atlantic Ocean.
54 BCE: Caesar successfully invades Britain but withdraws to Gaul.
54 BCE - 53 BCE: Ambiorix of the Eburones tribe destroys around 9,000 Roman soldiers at Atuatuca.
53 BCE: Julius Caesar holds council of Gallic tribes in Lutetia.
52 BCE: Caesar 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.
121 CE - 125 CE: First trip of Hadrian around the Empire: Gaul, Germany, Noricum, Britain, Tarraconis, Cappadocia, Gallatia, Bythinia, Asia, Greece, Mesia, Dacia and Pannonia.
256 CE: King Chrocus of the Alemanni invades Gaul and destroys the region.
256 CE: King Chrocus of the Alemanni invades Gaul and destroys the region until he is defeated at Arles by the Romans.
286 CE: Naval commander Carausius (Marcus Aurelius Mausaeus Valerius Carausius) declares himself emperor in Britain and Northern Gaul.
406 CE: Hun invasions force Vandals cross the Rhine into Gaul.
406 CE - 420 CE: Vandals cross the Rhine and invade Gaul, migrate to Spain.
406 CE - 407 CE: Vandals invade Gaul.
406 CE: Vandals, Suevi, and Alans invade Gaul.
451 CE: Hun invasion of Gaul; Battle of the Cataluanian Plains (Battle of Chalons).
451 CE: Attila's invasion of Gaul.
486 CE: Clovis of the Franks defeats the Romans in Gaul. Founding of the Frankish kingdom.
507 CE: Byzantine emperor Anastasios I sends Childeric, the king of the Franks in Gaul, a fleet to aid his war with the Ostrogoths.