Mithras had no mythology that anyone has found. The god who attracted devotees across the Roman Empire for three centuries, whose cult spread particularly among soldiers and merchants, whose underground temples — mithraea — have been excavated from Britain to the Euphrates, left no sacred texts, no founding narrative, no theology explained in its own terms. What we know about the Mithraic mysteries we know from the material record, from hostile Christian commentary, and from scholarly inference — a body of evidence that has produced sustained academic disagreement and no consensus on the most basic questions. Where did the cult come from? What did the central image mean? What happened in the ceremonies? The answers remain genuinely uncertain.