The church of Sant’Omobono sits above one of the highest human occupation sequences in the city of Rome. Some 3.5 m of sediment lie between the earliest known Bronze Age occupation lens and the base of the foundations of the early 6th c. B.C. temple, a further 13 m above which lies the floor of the present church, reconstructed in A.D. 1482. The site was sacred to the goddesses Fortuna and Mater Matuta for more than a millennium, before one of their temples was converted into a church of San Salvatore, rebuilt many times and eventually rededicated to Saints Anthony and Omobono. The archaeological remains were discovered by chance in 1936, when the dense neighborhood surrounding the church was demolished to make way for new Fascist infrastructure. The site was spared from further construction, and excavations continued sporadically through the latter half of the 20th c. This work was carried out by a diverse cast of archaeologists employing an equally diverse range of methodologies and field practices, though none of this work has been fully published. Since 2009, the Sant’Omobono Project, a collaboration between the University of Michigan, the Università della Calabria, and the Sovrintendenza Capitolina of the Comune di Roma, has continued this research with the goal of understanding and publishing whatever possible from the earlier excavations and bringing updated methodologies to bear on the site. While preparations for comprehensive publication are ongoing, the present article summarizes the main occupation and construction phases at the site as understood after 6 years of work by the project.
Tufo Lionato is a volcanic tuff that was used extensively for construction in Rome, Italy, during antiquity and after; at least three varieties can be identified: Anio, Monteverde, and Portuense. The widespread introduction of Tufo Lionato in Roman construction is generally dated to the mid‐second century before the common era (B.C.E.). Another tuff, Lapis Albanus, is held to have been introduced during the third century B.C.E. Due to their similar macroscopic appearance, it is impossible to reliably distinguish visually among varieties of Tufo Lionato, or between Lapis Albanus and other “peperino” tuffs, nor does geochemistry alone always allow definitive identifications. A combination of geochemical and petrographical analyses is presented here, to provenance building stone from the Roman temples of Fortuna and Mater Matuta at Sant’Omobono in Rome. The combination of techniques allows for secure identification of Anio tuff and Lapis Albanus, and their use in structures of the fourth–third and fifth–third centuries B.C.E., respectively, one to two centuries earlier than previously demonstrated. These findings show a diversification of tuffs used by the Roman construction industry earlier than henceforth acknowledged, and suggest the ability of archaeometric techniques to bring new perspectives even to such familiar archaeological contexts as the city of Rome.
This study reports on the discovery that the podium of the archaic temple in the Forum Boarium of Rome was built with a previously unknown tuff, of non-local origin. On the basis of detailed comparative petrographic and geochemical tests, it has been established that the blocks employed to build the earliest temple so far discovered in Rome belonged to a distinctive facies of tufo lionato that had never been characterized before, in contrast to what was reported by previous excavators. The blocks must have come from a quarry in the Anio River Valley, several kilometers from the construction site, making the Sant'Omobono temple the earliest known Roman building that extensively employed imported materials. The metrology of the blocks is also unique. This particular volcanic stone was probably chosen for its much greater resistance to weathering compared to the local tuffs, a trait that was essential in the flood-prone location, not far from the Tiber riverbank, where the temple was situated. The labor-intensive sourcing may also explain the dainty size of the temple podium in comparison to other sixth-century bc temples in the region. The choice made by the builders indicates far greater sophistication and technical awareness than they have generally been credited with. The new discovery is placed in the context of the quickly accumulating archaeological record of sixth-century bc Rome, which suggests a dramatic increase in the number and scale of monumental projects in the expanding city.
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