Ruderi di Coazzo, Archaeological site in San Basilio district, Rome, Italy

Ruderi di Coazzo is an archaeological site in the San Basilio district featuring two rooms with vaulted ceilings built from brick and tuff stone. The walls, standing roughly 3 meters high, incorporate materials from an earlier Roman villa that was later adapted for medieval monastic use.

A Roman villa originally occupied this spot and was used partly as a burial area in antiquity. In the 13th century, monks built a monastic building that incorporated the villa's remains and older tomb monuments into its construction.

The site is also known as Pietra de Oro, a name that survives alongside the Italian toponym Coazzo. The monastic building reused funerary material from nearby Roman tombs, so carved stone from graves is embedded in the walls of a 13th-century monastic settlement.

The ruins stand west of the San Basilio district, close to Via Bernardini and a short distance from Via Nomentana. The site is an open, unguarded archaeological remnant with no visitor facilities, so plan to reach it on foot and watch your footing among the fallen masonry.

In 1428, the Frangipane family transferred half the property to Saint Peter's Basilica, which later leased it out. This connection to one of Rome's most important structures reveals how this location played a role in the wider city's economy.