Of greater consistency is the archaic period settlement whose name is not known,[1] according to the studies of the data collected it had life and development at least from the prehistoric age up to the Hellenistic age, probably up to the time of its destruction by of the Roman republican army led by the consular tribune Marcus Furius Camillus of Veii, Capena and Falerii Veteres, cities with which it had intense continuity of relations throughout its cultural history.

[2] The morphological entity of the river terrace of Poggio Sommavilla-Grappignano at the confluence of the Tiber and the Aia torrent in front of the Treja (Paleotevere),[6][7] geologically made up of gravelly-sandy deposits, undoubtedly constitutes the area that boasts the greatest density and the most relevant deposits of the Tiber valley south of the confluence with the Nera, during Prehistory in the Paleolithic period.

The importance of the natural resources of the area, which combines extensive cultivated plains with an abundance of water resources identifiable with the presence of two water courses of significant flow such as the Tiber and L'Aia in front of the Treja river (Paleotevere), as well as with the ditches of Colle Rosetta and Grappignano, it certainly had a decisive impact on habitat choices in prehistoric times.

From the fantastic animals engraved in the finds of the necropolis of the archaic center of Poggio Sommavilla, very close analogies emerge with the materials from the Capenate and Faliscan areas.

Tomb 3 of Poggio Sommavilla released a grave goods characterized by decorative plant units and attributable to a single local workshop, equiniform figures prevail, similar ones were found on ollas in the Giglio necropolis of Magliano.