The carved relief of Mithras killing the Bull lies at the Southeastern of Thermes. The relief measures 1.12 m. width and 1.07 m. height. The god Mithras is depicted wearing a Persian garment and a Phrygian hat killing the sacred bull. Next to him are his followers with lighted torches. The representation is completed with a snake and an unknown figure, most likely a personification of the Sun. Scenes from the life of Mithras are depicted under the central relief. Essentially the stages of its apotheosis and the initiation of the believers in Zoroastrianism, the ancient Persian religion. During the Roman times Mithras was worshiped in the Empire through mystic ceremonies. Worship by the Roman legionaries was common since the worship of Mithras was a male privilege. This justifies its existence at this point where a Roman guard must have been installed at Stithoma to guard the mines in the area.