The Romans attempted to establish a garrison at Graviscae, but fever quickly killed off the inhabitants. Cato attributed te deaths to the "unhealthy air". Right up to the 19th Century the area was Malaria infested and it has only been this century that the Marenna has once more become fertile agricultural land as it was at the time of the Etruscans.
The Ancient city of Vetulonia continues to be excavated, together with its tombs. Aerial photographs show traces of an extensive wall system constructed possibly around the 4th century BCE, attesting to the presence of quite a significant settlement even by that time.
At the beginning of the 5th century BCE the tombs become less numerous, indicating the beginning of a crisis in the city. It is possible that at this stage Populonia started to emerge as the dominant city in the region, controlling the Metal deposits in the Colline Metalliferi of Metalliferous Hills, or perhaps the population shifted to nearby Russelae. In later times Vetluna continued to decline to obscurity.
Despite the decline of Vetluna, the Agricultural land and small settlements surrounding Vetluna continued to prosper as indicated by numerous remains found at Val Berretta, Saint Germano, Selvello.