Porto Clementino), in an unhealthy position on the coast (due to malaria from nearby marshes), became a Roman colonia which exported wine and had coral fisheries.
The main necropolis of Tarchuna, part of which can be visited today, is the Monterozzi necropolis with some 6,000 tombs, at least 200 of which include beautiful wall paintings, and many of which were tumulus tombs with chambers carved in the rock below.
The painted scenes are of a quality virtually unrivalled elsewhere in the Etruscan world and give a valuable insight into the secretive world of the Etruscans which is rarely documented.
It is said to have been already a flourishing city when Demaratus of Corinth brought in Greek workmen.
Descendants of Demaratus, Lucius Tarquinius Priscus and Lucius Tarquinius Superbus, became kings of ancient Rome.
The Spurinnas' tomb, known as the Tomba dell'Orco, is decorated with fine frescoes of a banquet uniting the famous members of the family who are identified by inscriptions.
The Spurinna family was prominent in Tarquinii up to the 1st Century AD.
He convinced the cities of Tarchuna and Veii to support him and led their armies against Rome in the Battle of Silva Arsia.
Although the Roman army was victorious it is recorded by Livy that the forces of Tarchuna fought well on the right wing, initially pushing back the Roman left wing.
Tarchuna, not affected by Celtic invasions, finally colonised all its previously held territories in about 385 BC.