Why did the Romans worship a Persian god? This book presents a new reading of the Mithraic iconography taking into account that the cult had a prophecy. It is likely that the Mithraic reliefs alluded to it and the scenes in the upper panels depict the Golden Age which was the final result of many apocalyptic, prophetic texts including the 4th Eclogue of Virgil. The Avesta, the Vedas, and Herodotus associate Mithras with the morning star and the dawn and this god was the mediator between darkness and light. Additionally, Mithras was a protector of rulers and, similar to Apollo, arbiter and mediator between opposite elements, and saviour of humankind. For these reasons he was ideal to become the god of Augustus and the Roman emperors.