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27 BC - The Roman Empire begins as Caesar Augustus becomes the first Roman Emperor.

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27 BC - The Roman Empire begins as Caesar Augustus becomes the first Roman Emperor.

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509 BC - Rome becomes a republic. The last king is overthrown and Rome is now ruled by elected officials called senators. There is a constitution with laws and a complex republican government.

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509 BC - Rome becomes a republic. The last king is overthrown and Rome is now ruled by elected officials called senators. There is a constitution with laws and a complex republican government.

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218 BC - Hannibal invades Italy. Hannibal leads the Carthage army in his famous crossing of the Alps to attack Rome. This is part of the Second Punic war.

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218 BC - Hannibal invades Italy. Hannibal leads the Carthage army in his famous crossing of the Alps to attack Rome. This is part of the Second Punic war.

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73 BC - Spartacus the gladiator leads the slaves in an uprising.

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73 BC - Spartacus the gladiator leads the slaves in an uprising.

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45 BC - Julius Caesar becomes the first dictator of Rome. Caesar makes his famous Crossing of the Rubicon and defeats Pompey in a civil war to become the supreme ruler of Rome. This signals the end of the Roman Republic.

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45 BC - Julius Caesar becomes the first dictator of Rome. Caesar makes his famous Crossing of the Rubicon and defeats Pompey in a civil war to become the supreme ruler of Rome. This signals the end of the Roman Republic.

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44 BC - Julius Caesar is assassinated on the Ides of March by Marcus Brutus. They hope to bring back the republic, but civil war breaks out.

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44 BC - Julius Caesar is assassinated on the Ides of March by Marcus Brutus. They hope to bring back the republic, but civil war breaks out.

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27 BC - The Roman Empire begins as Caesar Augustus becomes the first Roman Emperor.

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27 BC - The Roman Empire begins as Caesar Augustus becomes the first Roman Emperor.

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64 AD - Much of Rome burns. Legend has it that Emperor Nero watched the city burn while playing a lyre.

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64 AD - Much of Rome burns. Legend has it that Emperor Nero watched the city burn while playing a lyre.

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80 AD - The Colosseum is built. One of the great examples of Roman engineering is finished. It can seat 50,000 spectators.

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80 AD - The Colosseum is built. One of the great examples of Roman engineering is finished. It can seat 50,000 spectators.

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121 AD - The Hadrian Wall is built. To keep out the barbarians a long wall is built across northern England.

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121 AD - The Hadrian Wall is built. To keep out the barbarians a long wall is built across northern England.