Mithra instead of Jesus! The western world Zoroastrian, not Christian! The Persian Redeemer, always called the Light of the World in their scriptures; the helper of Ahura-Mazda, the Almighty, in his warfare with Ahriman, or Satan; the intercessor for men with the Creator; the Saviour of humanity; he, Mithra, might have been the central person of the dominant religion of Europe and modern times, but for certain developments in Athenian politics in the years between 490 and 480 B. C. For it is true that in the first three of four centuries of the Christian era the western world seemed to hesitate between the religion of Mithra and that of Christ; and if the Persians had completed the conquest of Greece in the fifth century B. C., Mithra might have so strengthened his hold upon Europe that the scale would have been turned forever in his direction. What was it that enabled the Greeks, in the crucial test, the ultimate contingency, to turn back the Persians and maintain their independence? History says that it was the result of the battles of Marathon and Salamis, in which the Greeks were triumphant over the Persians. This is true only in a limited sense. The battle of Marathon, in 490 B. C., did not save Greece, for the Persians came back again more powerful than ever. At Thermopylæ, Leonidas and his band died vainly, for the hosts of Xerxes overran all Greece north of the isthmus of Corinth. They took Athens, and burned the temples on the Acropolis. They were triumphant on the land. But at Salamis, in the narrow channel between the horseshoe-shaped island and the Attican mainland, Themistocles, on the 20th day of September, 480 B. C., adroitly led the great Persian fleet of six hundred vessels into a trap and defeated it in as heroic a fight as ever the men of the West fought against the men of the East. Seated on his "throne," or rather his silver-footed chair, on a hilltop overlooking the scene, Xerxes, the master of the world, beheld the destruction of his ships, one by one, by the leagued Greeks. When the battle was over he saw that the escape of his victorious army from the mainland was imperiled, and while there was yet time, he led his Persian horde in a wild flight across his bridge of boats over the Hellespont. The field of Platæa completed the check, and the Persian invasions of Europe were over forever.