According to traditional accounts Rome was first ruled by seven kings, Romulus, Numa Pompilius, Tullus Hostilius, Ancus Marcius, Lucius Tarquinius Priscus, Servius Tullius, Lucius Tarquinius Superbus, all of which, except Numa, are recorded as fighting successful wars against Rome's neighbours.
With the departure of Porsenna, war broke out between Rome and the other Latin states leading to the Battle of Lake Regillus in either 499 or 496 BC.