History › Classical age › Roman Empire
Roman Republic
509–27 BC (traditional dates)· Empire, kingdom or state· Europe
Mostly agreedGood evidence; some details, dates or numbers uncertain.
Rome's government after it expelled its kings, run by elected officials and a Senate, until it became an empire.
See it on the History map →What happened
Romans traditionally dated it to 509 BC, when they overthrew their last king. Two consuls, elected each year, led the state; the Senate of aristocrats advised them and controlled finances; citizen assemblies voted on laws and officials. Ordinary citizens (plebeians) won rights over centuries, including the Twelve Tables, Rome's first written laws (about 450 BC). Rome conquered Italy, defeated Carthage and took Greece. Civil wars in the first century BC ended it in 27 BC.
Why it matters
Its checks and balances, its Senate and the very word 'republic' directly influenced the US Constitution and many modern governments.
Think of it like
Like a board of directors (the Senate) with two co-CEOs (consuls) on one-year terms, so no one held power long.
How we know
Histories by Livy and by the Greek Polybius, who praised its 'mixed constitution'; Cicero's speeches and letters; inscriptions, coins and excavations in Rome.
Still debated
Its early history, including the 509 BC date, comes from writers centuries later and mixes legend with fact.
Inside this (1)
Connections (3)
▸Roman Republic became Roman EmpireWell documented
The connection
Rome's republic of annual magistrates, a Senate and assemblies was built for a city-state. As Rome conquered the Mediterranean, generals with loyal armies and vast wealth outgrew it, and a century of civil wars followed. In 27 BC the Senate granted Octavian the title Augustus; republican offices continued, but one man now held real power.
When and how
Rome, 133–27 BC; the Gracchi brothers, Marius, Sulla, Pompey, Caesar, Mark Antony and Octavian.
How we know
Writings of Cicero, Sallust and later historians, Augustus' own account of his deeds (the Res Gestae), and coins.
Debates and open questions
When the Republic really ended (49, 44, 31 or 27 BC), and whether its fall was inevitable, are debated.
▸Julius Caesar helped bring down Roman RepublicWell documented
The connection
Caesar used his Gallic army's loyalty and plunder to defy the Senate. Crossing the Rubicon in 49 BC, he started a civil war, beat Pompey and became dictator, an emergency office he held repeatedly and finally for life. This broke the Republic's core rule that no one should hold supreme power for long, and senators killed him to restore it.
When and how
Rome and the wider Mediterranean, 49–44 BC; Caesar, Pompey, Brutus and Cassius.
How we know
Cicero's letters, Caesar's own commentaries, and the biographies by Suetonius and Plutarch describe events in detail.
Debates and open questions
Whether the Republic was already doomed by earlier civil wars, making Caesar a symptom rather than a cause, is debated.
▸Roman Republic was a model for US ConstitutionWell documented
The connection
The framers knew Roman history well and borrowed from it: a Senate, checks between branches, and fear of one man seizing power, as Julius Caesar had. They wrote under Roman pen names; the Federalist Papers appeared as 'Publius.' They also studied why Rome's republic fell, hoping to avoid its fate.
When and how
Philadelphia and New York, 1787 to 1788: James Madison, Alexander Hamilton and others drew on Roman writers such as Cicero, Polybius and Plutarch.
How we know
Madison's convention notes, the Federalist Papers, and the founders' libraries and letters cite Rome repeatedly; the words 'Senate' and 'Capitol' come straight from Rome.
Debates and open questions
Rome was one influence among many, alongside Britain's constitution, Greek leagues, Enlightenment writers and colonial experience. How much weight each carried is debated, as is claimed Iroquois influence.