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| | | Bronze and Iron Age - The emergence of the Celts across Europe | |
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| | 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 | |
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| | 335 BC | Treaty between Celtic tribes and Alexander the Great | |
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| | 323 BC | Death of Alexander - Celtic tribes invade Greece | |
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| | 280 BC | Celtic tribes sack many Greek cities | |
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| | 275 BC | Celtic tribes establish the state of Galatia in Turkey | |
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| | 280 BC | Celtic tribes sack many Greek cities | |
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| | 230 BC | Celtic tribes defeated in battle by Greek troops in Turkey | |
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| | 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 | |
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| | 191 BC | Gaul is taken by the Romans | |
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| | 58-51 BC | Julius Caesar leads the Romans in the Gallic Wars. In 55BC he invades Britain | |
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| | 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 | |
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| | 39 | Caratacus leads the British celts | |
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| | 43 | Emperor Claudius subdues the Celts in Britain | |
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| | 45 | Vercingetorix the leader of the Celtic Tribes is paraded through Rome and executed | |
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| | 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 merge in the lands of the Celts and the history of each country changed accordingly. | |
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