<Tr> <Th_colspan="2"> Belligerents </Th> </Tr> <Tr> <Td> L. Junius Brutus Patricians Plebeians </Td> <Td> L. Tarquinius Superbus </Td> </Tr> <P> The overthrow of the Roman monarchy, a political revolution in ancient Rome, took place around 509 BC and resulted in the expulsion of the last king of Rome, Lucius Tarquinius Superbus, and the establishment of the Roman Republic . </P> <P> The semi-legendary Roman histories tell that while the king was away on campaign, his son Sextus Tarquinius raped a noblewoman, Lucretia . Afterwards she revealed the offence to various Roman noblemen, and then committed suicide . The Roman noblemen, led by Lucius Junius Brutus, obtained the support of the Roman aristocracy and the people to expel the king and his family and to institute a republic . The Roman army supported Brutus, and the king went into exile . Despite a number of attempts by Lucius Tarquinius Superbus to reinstate the monarchy, the citizens established a republic and thereafter elected two consuls annually to rule the city . </P>

Who did the romans overthrow to become a republic