The city was situated on a high spur of rock that stands out as a promontory from the Volscian Mountains known as “Monti Lepini” and looks onto the Pontine plains with a breathtaking panorama. The notable natural defenses were, even during that time, enlarged with strong polygonal walls, and they had the goal of even transforming the summits of the hills into large terraces at different levels.
Norba, founded, it seems, in the seventh century B.C., becoming a Roman colony in 492 B.C., and it remained as such for the entire Republic era, resisting many attacks.
Its very strong strategic position and greatness were its defensive walls.
Then, in the civil war between Mario and Sulla, the city was on Mario's side, and it was his last fortress to fall; but its fall was not due to surrender but rather to betrayal, and it signaled the end of the city.
Many of the inhabitants, not supporting the defeat, took their own lives, setting the city on fire, and it is said that the gods fed the fire with a very strong wind that rose suddenly, so much that the entire city was completely destroyed, and Lepido's army could not bring back any plunder.
It must have been a real tragedy, and the city was never again reconstructed; so today we can read the intact urban and road fabric of the city from the first century B.C.