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500 BCE
400 BCE
300 BCE
200 BCE
100 BCE
0 CE
475 BCE: Celts defeat the Etruscans at the Ticino River.
450 BCE - 400 BCE: The 'Prince of Glauberg', a sandstone statue of a Celtic warrior, is made.
396 BCE: Celts defeat an Etruscan army at the battle of Melpum. Afterwards the Celts heavily settle all over the Po Valley.
390 BCE: Gauls sack Rome.
390 BCE: "Gallic Catastrophe:" Brennus of the Senones defeats the Romans at Allia, and subsequently sacks Rome.
380 BCE: Celtic groups, possibly from northern Italy and the eastern Alps, begin to raid Illyrian territories.
367 BCE: Celtic mercenaries fight with the Spartans against Thebes.
367 BCE: Livy mentions Celtic armies in Ancona and one such group moves against Rome once more.
297 BCE: Celts and Samnites join forces and defeat the Romans at Camertium.
295 BCE: In a battle lasting all day, Romans narrowly defeat a force of Celts and Samnites at Sentinum.
285 BCE - 282 BCE: Rome defeats the Celts in Italy. Rome's dominance in central Italy is secured.
284 BCE: Gauls of the Insubres and Boii tribes defeat the Romans at Arretium.
283 BCE: Romans defeat the Etruscans and Celts at lake Vadimo.
280 BCE: Celts join with Pyrrhus, aiding in his victory over the Romans at Heraclea.
279 BCE: Gauls attack the sanctuary of Delphi.
279 BCE: Celts stay with Pyrrhus and fight in the Epirote army at Asculum, a victory over the Romans.
279 BCE: Celts invade Thrace and Anatolia.
277 BCE - 276 BCE: 4,000 Celts are employed in Egypt under Ptolemy II.
275 BCE: Seleucids successfully defeat the Galatian Celts in the 'Elephant Battle'.
263 BCE: Antaros and 3000 Celts fight with Carthage in the First Punic War.
261 BCE: Antiochus I Soter of the Seleucid Empire killed in battle against the Galatians at Ephesus in Asia Minor.
259 BCE: Celts in Egypt fail to overthrow Ptolemy II and are starved to death on an island.
237 BCE - 241 BCE: Attalus I of Pergamon defeats the Galatians at the headwaters of the Caioc River.
232 BCE: Attalos I defeats the Galatians a second time.
225 BCE: Two Roman armies surround and defeat a Celtic army at Telamon.
225 BCE: Celts defeat 6000 Romans at Faesulae and proceed to overrun Etruria.
223 BCE: Romans successfully campaign against Celtic tribes of Cisalpine Gaul.
222 BCE: Rome conquers Cisalpine Gaul (modern-day Provence, France).
218 BCE: The Aegosages Celts enter Anatolia under Attalos of Pergamon.
217 BCE: 14,000 Celts serve under Ptolemy IV in his victory at Raphia over the Seleucid King Antiochus III.
217 BCE - 218 BCE: 30,000 Celtic infantry and 4,000 Celtic cavalry join Hannibal. Celts constitute just over 50% of his army in Italy.
200 BCE: Iron in the Celtic world experiences a significant boom. Iron manufacturing increase in all facets of life such as weapon construction and agriculture items.
193 BCE: The Boii are defeated by the Romans, suffering, according to Livy, 14,000 dead.
137 BCE: 4,000 Celtiberians trap a force of 20,000 Romans at Numantia forcing their surrender.
125 BCE: Rome intervenes on behalf of Massalia against the Saluvii Celts.
106 BCE: The governor of the Roman province of Macedonia, M. Minucius Rufus, celebrates his victory over a raid of the Dacians allied with the Celtic tribe of the Scordiscii in the Balkans.
82 BCE - 46 BCE: Life of Vercingetorix.
64 BCE: Galatia becomes a client state of Rome.
58 BCE - 51 BCE: Julius Caesar's conquest of Gaul.
58 BCE: Caesar attacks the Helvetii while on migration and defeats them.
57 BCE: A Roman army under Caesar narrowly defeats an army of Nervii, Atrebates, and Viromandui.
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.
52 BCE: Julius Caesar is defeated at Gergovia by Vercingetorix.
52 BCE: After becoming trapped and besieged at Alesia, Vercingetorix surrenders to Caesar.
52 BCE: Caesar sacks the city of Avaricum.
51 BCE - 30 BCE: 300 Celts serve as elite bodyguards for Cleopatra VII during her reign.
51 BCE: Caesar's siege and capture of Uxellodunum ends the Gallic War.
46 BCE: The Bellovaci unsuccessfully rise against Roman rule in Belgica.
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.
43 CE - 47 CE: Romans conquer South Britain and claim the territory as part of Roman Empire.
51 CE: Briton rebel leader Caratacus defeated, rebellion crushed.
60 CE - 61 CE: Boudicca revolts, the Legio II Augusta does not respond to a call to arms.