<P> Although the Senate had initially agreed to Tarquin's request for a return of his family's effects, the decision was reconsidered and revoked after the discovery of the conspiracy, and the royal property was given over to be plundered by the Roman populace . </P> <P> Tarquinius next attempted to regain Rome by force of arms . He first gained the support of the cities of Veii and Tarquinii, recalling to the former their regular losses of war and land to the Roman state, and to the latter his family ties . The armies of the two cities were led by Tarquinius against Rome in the Battle of Silva Arsia . The king commanded the Etruscan infantry . Although the result initially appeared uncertain, the Romans were victorious . Both Brutus (the consul) and Arruns (the king's son) were killed in battle . </P> <P> Another attempt by Tarquinius relied on military support from Lars Porsenna, king of Clusium . The war led to the siege of Rome, and finally a peace treaty . However, Tarquinius failed to achieve his aim of regaining the throne . </P> <P> Tarquinius and his family left Clusium, and instead sought refuge in Tusculum with his son - in - law Octavius Mamilius . In about 496 BC, Tarquin and his son Titus fought with Mamilius and the Latin League against Rome, but lost, at the Battle of Lake Regillus at which Mamilius perished . </P>

What led to the end of the roman monarchy