Gimmeldingen Mithraeum, Roman temple ruins in Gimmeldingen, Germany

The Gimmeldingen Mithraeum was a Roman temple to Mithras on a south-facing slope at 166 m, bounded by Loblocher Strasse below and Kurpfalzstrasse above, about 10 m higher. A Roman named Materninius Faustinus dedicated it on 23 January 325 CE. In 1926, foundation walls, four votive altars and a relief of the tauroctony were found west of St Nicholas Church, which was built over the site in the Romanesque period.

The temple was built in 325 CE and served Roman soldiers and merchants who established an underground sanctuary during the late empire. It was constructed during a period when this religious movement was gradually losing influence across the Roman world.

This was a gathering place where a religious community met for private ceremonies and shared meals. The arrangement of benches along the sides reveals how members came together to participate in rituals and initiation rites.

The original stone artifacts from the site are displayed at the Historical Museum of the Palatinate in Speyer. Replicas have been placed at the original location for visitors to view.

Archaeological evidence suggests this was one of the last temples of its kind to be built so late in the Roman Empire. Its timing makes the site a rare record of a religious practice that had already disappeared in most other regions.