The cult of Mithraism spread from the Middle East to other parts of the Roman Empire throughout the Mediterranean basin, at first by military-political adventurers, travelers, slaves and merchants from the Orient.

In the absence of such topographical features, they excavated the soil and built the small single-celled temple (spelaea) to reinforce the impression of a cave.

The remains of the Mithraeum in Jajce were discovered accidentally during excavation for the construction of a private house in 1931.

[1] The site was purchased by the Society for the Preservation of Antiquities in Jajce and soon after a protective stone and mortar structure was constructed under the supervision of engineer F. Steiner.

A new facility replaced the previous one following the 2012 renovation, which cost approximately 260,000 KM (BAM) and was carried out under the MDG-F program "Promotion cultural understanding in Bosnia and Herzegovina" with the financial support of the Kingdom of Spain government.