The elder mithraeum was built into a slope behind "Villa Wirth", very close to the shore of the Main to the north of the fort.
The 11.5m x 6.5m large room had traces of a fire and was destroyed. The cult image was missing. This was usually displayed at the front of the room. After the fire the room was filled in and used as a waste pit. It is possible that the shrine was moved to a more secure site south of the southwestern fort corner and rebuilt as Mithraeum I.
Coin finds indicate construction after 157 AD, destroyed around 210 AD, at the earliest.
Current State: built over
Monument Protection: Yes - UNESCO World Heritage Site, 2005
Research: Discovered and excavated 1909/1910
Bavarian State Conservation Office – Landesstelle für die nichtstaatlichen Museen & Bavarian State Archaeological Collection with the support of the Bayerische Sparkassenstiftung