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Mithras is a Persian light and warrior god adopted by the Roman army as their tutelary deity. His name means “Friend”. Mithras was the emissary of Ahura Mazda, the supreme power of good, who battled Ahriman, the supreme evil. Mithras slew the divine bull to release its life-giving blood into the earth, and creatures that served Ahriman like scorpions and serpents tried to stop this happening. Mithras was often depicted with a pointed cap, and a number of reliefs show him in the act of slaying the bull. As a solar god he was directly equated to Sol Invictus by the Romans, as can be seen from inscriptions.[469] Twelve inscriptions to him have been found to date.[470] There were seven grades in the Mithraic mysteries, which were only open to free men. The Mithraic cult was highly tolerant of other deities, as is evidences by depictions of other gods in the shrines. Also as the soldier god, priesthoods were known to bring their statues to the Mithraea (temples) for protection when danger threatened. The Mithraea were usually small, and have preserved their mysteries to an extent as little writing remains from them. A relief from Housesteads (Northumberland) shows Mithras bearing a sword and spear rising from an egg, surrounded by a hoop depicting the signs of the zodiac. A silver amulet found at St Albans similarly depicts Mithras rising from a pile of stones. More commonly images on altars showed him sacrificing a bull, such as at Rudchester (Northumberland), Carrawburgh (Northumberland) and the London Mithraeum. There are now five known Mithraea in Britain, those at Caernarvon, Carrawburgh, Housesteads, London and Rudchester. Of these all were purely military apart from the London Mithraea.
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David Rankine (The Isles of the Many Gods: An A-Z of the Pagan Gods & Goddesses of Ancient Britain Worshipped During the First Millenium Through to the Middle Ages)