Created more than a century before the eruption of Mount Vesuvius in 79 C.E., the wall paintings provide rare insights into secret rituals conducted in the Roman city

Archaeologists in Pompeii have uncovered rare, nearly life-sized frescoes that offer fresh insight into religious practices in the ancient city before it was destroyed by Mount Vesuvius in AD 79, the site said on Wednesday.

The House of Thiasus got its name from the “thiasos,” or sacred procession, of Dionysus. The fresco matches the Second Style of Pompeian wall painting, which was prevalent between the 40s and 30s BC. This means the painting had already existed for over a century when the eruption of Mount Vesuvius in 79 AD buried it under ash and pumice.