Back-Story, Early Antique Era
San Unil, as it is known today, had a flourishing culture long before the Romans arrived. A number of religious cults co-existed peacefully and were woven into the very fabric of society. The town was larger then than it is now, deriving its wealth from distinctive style of pottery that's been found as far away as Morocco and the British Isles and from some iron-stone working. Today, the cliffs mark the edge of town, but recent archæological excavations reveal that there in the Etruscan period there was a port.
As is common in the Tufa areas of Tuscany, there's an extensive network of caves beneath the town, and it appears that some were in use before 2500BCE. Some are natural, others man-made: many of the houses have cellars that connect to this network, making it a maze that can only be visited with a local guide, because it’s easy to get lost. Parts of the system have not been explored within living memory.
When the Romans came, what happened was a mix of assimilating the deities of the various cults into the Roman state religion, and suppressing them entirely. The cult of The Lady (no evidence survives to indicate the name by which she was known at the time, in which we are interested, was assimilated, but the temple was completely razed and a municipal office (now the town museum) was built over the top as an expression of Roman superiority. The statue was moved to a side-chapel of the temple in the main square, and worship there appears to have continued until around 800CE, when it was suppressed by the new Christianity.
As frequently happened, however, the Romans failed to completely erase the earlier cult, and it is known that there were adherents of the Cult of The Lady well into the period of the occupation. To what extent these were accepted as 'pagani' (people who did not convert to the state religion) and to what extent they worshipped in secret, is not known, and probably never will be.