a regional capital city. The final resolution of the question waits for more evidence. It is believed that Clusium joined the Etruscan League of twelve cities in the 600s BC, to defend against the Roman king Tarquinius Priscus. Lars Porsena was king of Clusium in 508 BC. Lucius Tarquinius Superbus, formerly king of Rome, had been expelled along with his family from Rome in 509 BC. He had sought to regain the throne, firstly by the Tarquinian conspiracy and secondly by force of arms. Both attempts had been unsuccessful, the conspiracy having been discovered, and Tarquin's army having been defeated at the Battle of Silva Arsia. Tarquin convinced Lars Porsena to lead his army against Rome. The war between Clusium and Rome followed, during which Porsena besieged Rome. The siege and the war ended with a peace treaty, by which Porsena received hostages from Rome and returned to Veii lands that had previously been taken by Rome. In 507 BC Rome's hostages and lands were restored, and peace between Rome and Porsena was cemented. Tarquinius was not restored to the Roman throne. In 508 BC, after the siege of Rome, Porsena split his forces and sent part of the Clusian army with his son Aruns to besiege the Latin city of Aricia. The Clusians besieged Aricia; however the Aricians sent for assistance from the Latin League and from Cumae, and the Clusian army was defeated in battle. Pliny the Elder wrote that a magnificent tomb was built for Porsena; a large mausoleum surrounded by cascades of pyramids over a labyrinth of underground chambers in which an intruder could get lost. Pliny never saw this tomb, so his description was based on a report from Varro and perhaps a conflated comparison to the Minoan labyrinths he describes before this tomb. Large-size tumuli of the late archaic period were built at Chiusi, and modern scholars have tried to associate these (especially Poggio Gaiella) with the legendary tomb of Porsena. In the early 4th century BC (391 BC according to Varronian chronology) it was besieged by Gauls, and the Clusines called upon Rome to intermediate. However, in the following negotiations, one of the Roman delegates, of the gens Fabia, killed a Gallic leader. When the Romans refused to hand over the Fabii and in fact appointed two members of the family as consuls for the next year, the enraged Gauls broke up their