As it spread westward, Zoroastrianism encountered other types of religion and underwent their influences. Similarly, the Mazdaism of the Achaemenids did not remain unchanged. Xerxes, son of Darius, forbade the cult of the daēvas throughout his kingdom—which brings him still closer to the religion of Zarathustra. But later, and precisely from the time of the inscriptions of Artaxerxes II (405–359), Mithra and Anāhitā appear beside Ahuramazdā. Now, as we shall see, a similar syncretism manifests itself in the late Avesta, where the same gods’ names are cited beside Ahura Mazdā and the Amesha
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