In Greek and Roman mythology, the Palladium or Palladion (Greek Παλλάδιον (Palladion), Latin Palladium) was a cult image of great antiquity on which the safety of Troy and later Rome was said to depend, the wooden statue (xoanon) of Pallas Athena that Odysseus and Diomedes stole from the citadel of Troy and which was later taken to the future site of Rome by Aeneas. The Roman story is related in Virgil's Aeneid and other works. Rome possessed an object regarded as the actual Palladium for several centuries; it was in the care of the Vestal Virgins for nearly all this time. Since around 1600, the word palladium has been used figuratively to mean anything believed to provide protection or safety, and in particular in Christian contexts a sacred relic or icon believed to have a protective role in military contexts for a whole city, people or nation. Such beliefs first become prominent in the Eastern church in the period after the reign of the Byzantine Emperor Justinian I, and later spread to the Western church. Palladia were carried in procession around the walls of besieged cities and sometimes carried into battle. The Trojan Palladium Origins The Trojan Palladium was said to be a wooden image of Pallas (whom the Greeks identified with Athena and the Romans with Minerva) and to have fallen from heaven in answer to the prayer of Ilus, the founder of Troy. "The most ancient talismanic effigies of Athena", Ruck and Staples report, "were magical found objects, faceless pillars of Earth in the old manner, before the Goddess was anthropomorphized and given form through the intervention of human intellectual meddling." Arrival at Troy The arrival at Troy of the Palladium, fashioned by Athena in remorse for the death of Pallas, as part of the city's founding myth, was variously referred to by Greeks, from the seventh century BC onwards. The Palladium was linked to the Samothrace mysteries through the pre-Olympian figure of Elektra, mother of Dardanus, progenitor of the Trojan royal line, and of Iasion, founder of the Samothrace mysteries. Whether Elektra had come to Athena's shrine of the Palladium as a pregnant suppliant and a god cast it into the territory of Ilium, because it had been profaned by the hands of a woman who was not a virgin, or whether Elektra carried it herself or whether it was given directly to Dardanus vary in sources