Hmmm….interesting.
The term "Mithraism" is a modern convention. Writers of the Roman era referred to it by phrases such as "Mithraic mysteries", "mysteries of Mithras" or "mysteries of the Persians".[1][12] Modern sources sometimes refer to the Greco-Roman religion as "Roman Mithraism" or "Western Mithraism" to distinguish it from Persian worship of Mithra.[1][13][14]
The event takes place in a cavern, into which Mithras has carried the bull, after having hunted it, ridden it and overwhelmed its strength.[39] Sometimes the cavern is surrounded by a circle, on which the twelve signs of the zodiac appear. Outside the cavern, top left, is Sol the sun, with his flaming crown, often driving a quadriga. A ray of light often reaches down to touch Mithras. At the top right is Luna, with her crescent moon, who may be depicted driving a biga.[40]
In some depictions, the central tauroctony is framed by a series of subsidiary scenes to the left, top and right, illustrating events in the Mithras narrative; Mithras being born from the rock, the water miracle, the hunting and riding of the bull, meeting Sol who kneels to him, shaking hands with Sol and sharing a meal of bull-parts with him, and ascending to the heavens in a chariot.[40] In some instances, as is the case in the stucco icon at Santa Prisca Mithraeum in Rome, the god is shown heroically nude.[41] Some of these reliefs were constructed so that they could be turned on an axis. On the back side was another, more elaborate feasting scene. This indicates that the bull killing scene was used in the first part of the celebration, then the relief was turned, and the second scene was used in the second part of the celebration.[42] Besides the main cult icon, a number of mithraea had several secondary tauroctonies, and some small portable versions, probably meant for private devotion, have also been found.[43]
Banquet
The second most important scene after the tauroctony in Mithraic art is the so-called banquet scene.[44] The banquet scene features Mithras and Sol Invictus banqueting on the hide of the slaughtered bull.[44] On the specific banquet scene on the Fiano Romano relief, one of the torchbearers points a caduceus towards the base of an altar, where flames appear to spring up. Robert Turcan has argued that since the caduceus is an attribute of Mercury, and in mythology Mercury is depicted as a psychopomp, the eliciting of flames in this scene is referring to the dispatch of human souls and expressing the Mithraic doctrine on this matter.[45] Turcan also connects this event to the tauroctony: the blood of the slain bull has soaked the ground at the base of the altar, and from the blood the souls are elicited in flames by the caduceus.[45]
https://en.wikipedia.org/wiki/Mithraism
leontocephaline lead to this dig.