Final answer:
The Etruscan king Lucius Tarquinius was expelled in 509 BCE leading to the establishment of the Roman Republic after his son's atrocious act against Lucretia incited a rebellion among the Romans.
Step-by-step explanation:
The Romans cherishing their autonomy and rule of law vowed never to be subject to tyranny again and transitioned to a new form of government where elected senators would make important political decisions reflecting a profound respect for legal authority and a rejection of autocracy.