The overthrow of the Roman monarchy was an event in ancient Rome that took place between the 6th and 5th centuries BC where a political revolution replaced the then-existing Roman monarchy under Lucius Tarquinius Superbus with a republic. The details of the event were largely forgotten by the Romans a few centuries later; later Roman historians invented a narrative of the events, traditionally dated to c. 509 BC, but this narrative is largely believed to be fictitious by modern scholars.