1400 BCE: The beginning of Celtic culture in the upper Danube region of central Europe.

600 BCE: The Hirschlanden Warrior, a sandstone representation of a Celtic Warrior from Ludwigsburg, Germany, is made.

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.

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.

60 CE - 61 CE: Boudicca revolts, the Legio II Augusta does not respond to a call to arms.