Dionysius of Halicarnassus lists Saturnia as one of the towns first occupied by the Pelasgi and then by the Etruscan civilization. A Roman colony arrived in 183 BC, but little is known about it other than the fact that it was a prefecture. There are still remains of the city walls, in the polygonal style, which contain Roman gateways. Roman remains have also been discovered within the town, and remains of tombs outside. These tombs were originally covered by tumuli, which have now disappeared, so that George Dennis, author of "Cities and Cemeteries of Etruria", mistook them for megalithic remains.