CIMRM Supplement - Mithraeum. Thermes, Greece.

At Kato Thermes in Greece, there is a very weathered relief of Mithras killing the bull in a rock-cliff. It was originally discovered in 1915.

From: Archaeology Magazine:

April 2010: After decades of controversy, a long-closed sanctuary of Mithras was finally reopened. This Mithraeum is located in the Rhodope Mountains in the town of Thermes on the border between Greece and Bulgaria. Because of the tensions between Communist Bulgaria and Greece in the 20th century, the site's excavator, Bulgarian archaeologist--and eventual prime minister--Bogdan Filov, conducted no further enquiries into the site after his initial foray in 1915. So far, the findings merely consist of a sacred spring and a sculptured relief. Bulgarian officials have called for increased Greek involvement in a further investigation, which will lead to a planned tourist venture in the area. Interestingly, Bulgarian archaeologist Nikolay Ovcharov identified the veneration of rocks as a cultic ritual that was part of this Mithraic complex, resonating with the story of Mithras's rock birth. Coordinates: 41° 21' 11" N, 24° 58' 30" E / 41.353° N, 24.975° E. Carly Silver, "Bull-Killer, Sun Lord," Archaeology: A Publication of the Archaeological Institute of America (August 24, 2010). Online here.

According to Greek Wikipedia, the relief shows Mithras killing the bull between Cautes and Cautopates. Under the bull, the snake can be made out, and on one side another form, which might be Sol or Luna. At the bottom are a series of frames from the cycle of the god,. The relief dates to the 2-3rd century. The information is referenced to archaeologists Marie-Gabrielle Parisaki and Louisa Loukopoulou.

An article online states ¹ that the relief is 6km from the Bulgarian border and is accessible using the Zlatograd customs crossing.

Dr Szabo Csaba adds, in his list of new finds: "Interestingly, Bulgarian archaeologist Nikolay Ovcharov identified the veneration of rocks as a cultic ritual that was part of this Mithraic complex, resonating with the story of Mithras's rock birth."