| | Bronze and Iron Age - The emergence of the Celts across Europe |
| 400BC | Celts had settled in many European countries including Austria, Britain, France, Holland, Belgium, Switzerland, Western Germany, Northern Spain, Turkey and Hungary
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| 400 BC | Celtic tribes invade Italy and under the leadership of Brennus sack Rome |
| 335 BC | Treaty between Celtic tribes and Alexander the Great |
| 323 BC | Death of Alexander - Celtic tribes invade Greece |
| 280 BC | Celtic tribes sack many Greek cities |
| 275 BC | Celtic tribes establish the state of Galatia in Turkey |
| 280 BC | Celtic tribes sack many Greek cities |
| 230 BC | Celtic tribes defeated in battle by Greek troops in Turkey |
| 224 BC | The Romans had begun to extend their empire into Gallia ( Gaul) the region of Europe occupied by Celtic tribes
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| 224 BC | 224 - 220 BC - Rome conquers the Celts |
| 191 BC | Gaul is taken by the Romans |
| 58-51 BC | Julius Caesar leads the Romans in the Gallic Wars. In 55BC he invades Britain |
| 0 | Birth of Jesus Christ
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| 33 AD | Crucifixion of Jesus in the Roman province of Jerusalem and starts the spread of Christianity |
| 39 | Caratacus leads the British celts |
| 43 | Emperor Claudius subdues the Celts in Britain |
| 45 | Vercingetorix the leader of the Celtic Tribes is paraded through Rome and executed |
| 60 | Boudicca leads a failed rebellion against Rome. The Celtic culture starts to become assimilated with Roman culture
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| 476 | The Roman Empire collapses and in the Dark and Middle Ages various different cultures emerge in the lands of the Celts and the history of each country changed accordingly.
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