The 'Mithraic cave' in the Gradische/Gradišče massif near St. Egidio contained vessels decorated with snakes and the remains of chicken bones and other animals that were consumed during Mithraic ceremonies.
This Mithraic temple, now disappeared, is known thanks to the numerous remains recorded since 1594 in the 'Memorie di varie antichità trovate in diversi luoghi della città di Roma'.