From Artaxerxes II (404–359/358) onward, the inscriptions mention, besides Auramazda, Mithra and the goddess Anahita (Anahit), which proves only a change of emphasis, not the appearance of new deities. The Arsacid period
In consequence of Alexander’s conquest, the Iranian religion was almost totally submerged by the wave of Hellenism. At Susa, for instance, which had been one of the capital cities of the Achaemenids but where the religion of Auramazda was not indigenous, the coinage of the Seleucid and Arsacid periods does not represent a single Iranian deity.
Then the Iranian religion gradually emerged again. In Commagene in the middle of the 1st century bce, gods bear combinations of Greek and Iranian names: Zeus Oromazdes, Apollo Mithra, Helios Hermes, Artagnes Herakles Ares. The first proof of the use of a Zoroastrian calendar, implying the official recognition of Zoroastrianism, is found some 40 years earlier at Nisa (near modern Ashgabat in Turkmenistan). By then some form of orthodoxy must have been established in which Auramazda and the entities (powers surrounding him) adjoin other gods such as Mithra, the Sun, and the Moon.
In Persis (modern Fārs), from the beginning of the Christian Era to the advent of the Sāsānians (early 3rd century ce), any allusion to the fire cult disappears. The coins seem to indicate, in not showing the fire altar, that the prince had lost interest in the Iranian religion. The Sāsānian period
With Ardashīr, the future founder of the Sāsānian dynasty, the situation was different, and this may suggest that his religious zeal—as a hereditary priest of Staxr (Istaxr)—may have helped him seize power in his native province, even before he started attacking his Arsacid suzerain, Artabanus V.
Two persons are recorded, in different sources, as helping to establish Zoroastrianism under the first Sāsānians: Kartēr and Tansar. Whereas Kartēr is known through contemporary inscriptions, most of which were written by himself, Tansar (or Tosar) is only remembered in later books. The latter tell us that Tansar, an ehrpat, or theologian, undertook the task, under Ardashīr’s command, of collecting the sacred texts and fixing the canon. Kartēr, who was already active under Ardashīr I but more so under Shāpūr and his successors, recounted his brilliant career, which reflects the birth of a hierarchy. He was still an ehrpat under Shāpūr, as he restored the “Mazdean religion…in the land of non-Iran reached by the horses and men of the king of kings.” Under Hormizd he was made Ormazd’s magupat, a term apparently created for him and meaning “chief of the Magians of Auramazda.” Under Bahrām I (273–276), Mani, the founder of Manichaeism, who had enjoyed a degree of tolerance under the two preceding kings, was sacrificed to the interests of Zoroastrianism and died in prison. Bahrām II named Kartēr “Saviour of the Soul of Bahrām,” elevated him to the rank of the “grandees of the realm,” and gave him the additional titles of “judge of the empire,” “master of rites,” and “ruler of the fire of Anahit-Ardashīr at Staxr and of Anahit the Dame.” Promoted to the apex of his career, Kartēr persecuted “Jews, Buddhists, Brahmins, Nasoreans [Judeo-Christians?], Christians, Maktaks [Mandeans, Manichaeans?], and Zandīks [Mazdean heretics].” Narses (293–302), who began his struggle for power when Bahrām II was still on the throne, seems to have recovered the title of chief of the Staxr temple that his predecessor and adversary had surrendered to Kartēr. Under Shāpūr II, the high priest Aturpāt, at a council summoned to fix the text of the Avesta, proved the truth of his doctrine by submitting to the ordeal of molten metal poured on his breast and was victorious over all kinds of sectarians and heretics.
Under Bahrām V (420–438), presumably, the title magupatān magupat (chief magus of the chief magi) was created. Under Qobād (or Kavādh; 488–496 and 498/499–531), Iran traversed its gravest social and religious crisis under the impact of Mazdak. This reformer, whose doctrines were partly inspired by those of Mani, was granted an interview by Qobād—as Shāpūr I had received Mani a long time before, but with a more decisive success. Perhaps the king hoped that by abolishing property and the family he would reign over a docile mass. The Mazdakites favoured the abolition of all social inequalities, chiefly of private property, the main cause of all hatred. Everything was to be held in common, including women. These views directly threatened the rich as well as the Mazdean clergy, who soon understood this. Qobād was dethroned and replaced by his brother Jāmāsp. After two years in exile, Qobād recovered his throne, but he had been cured of his egalitarian views and decided to liquidate the Mazdakites.
Khosrow I continued the work of his father, Qobād, and thus the Mazdakite upheaval made way for a strong state and an established Mazdean Church. The religious books give Khosrow the unique title of anōshirvan, “with the immortal soul,” probably for having crushed Mazdakism and for enabling the “good religion” to triumph.
Khosrow II (590/591–628) married a Christian woman and may have been a Christian himself. He was superstitious and dabbled in astrology. Post-Islamic Iranian Zoroastrianism
Islam won a decisive victory at al-Qādisiyyah in 635 over the armies of Yazdegerd III, the last Sāsānid. Islam, in principle, tolerated the ancient religion, but conversions by persuasion or force were massive in many provinces. Zoroastrianism fomented rebellion and brought persecutions upon itself. There were pockets of survival, notably in Persis, the ancient centre of the Achaemenian and Sāsānian empires. Books were produced to save the essentials of the religion from a threatened disaster. The disaster did occur, but exactly why and how is not known. Zoroastrians, called Gabars by the Muslims, survived in Iran as a persecuted minority in small enclaves at Yazd and Kerman. The Parsis in India
From the 10th century onward, groups of Zoroastrians emigrated to India, where they found asylum in Gujarat. Their connection with their coreligionists in Iran seems to have been almost totally broken until the end of the 15th century. Reestablished in 1477, the connection was kept up chiefly in the form of an exchange of letters until 1768. Under British rule, the Parsis, who previously had been humble agriculturists, started to enrich themselves through commerce, then through industry. They became a most prosperous and “modern” community, centred in Bombay (Mumbai). Formerly they had adopted the Gujarati language and the dress of their Hindu milieu. Later they adopted British customs, British dress, the education of girls, and the abolition of child marriage. In their enterprises as well as in their charities, they followed the example of the West. From the 19th century on, they were able to help their less-favoured brethren in Iran, either through gifts or through intervention with the government.
They also adapted themselves to their Indian culture by minimizing what was repugnant to the Hindus—namely, blood sacrifice—and they surrendered to some extent to the vogue of astrology and to theosophy. On the other hand, ever since they were attacked by Christian missionaries for their dualism, they have been emphasizing the monotheistic aspect of their doctrine. Beliefs and mythology Sources
Only the hymns, or Gāthās, are attributable to Zarathustra. They are written in various metres and in a dialect different from the rest of the Avesta, except for seven chapters, chiefly in prose, that appear to have been composed shortly after the prophet’s demise. All these texts are embedded in the Yasna, which is one of the main divisions of the Avesta and is recited by the priests during the ceremony of the same name, meaning “sacrifice.” The Visp-rat (“All the Judges”) is a Yasna augmented here and there by additional invocations and offerings to the ratus (lords) of the different classes of beings. The Vidēvdāt, or Vendidad (“Law Rejecting the Daevas”), consists of two introductory sections recounting how the law was given to human beings, followed by 18 sections of rules. The Siroza enumerates the deities presiding over the 30 days of the month. The yashts (hymns) are each addressed to one of 21 deities such as Mithra, Anahita, or Verethraghna. The Hadhoxt Nask (“Section Containing Sayings”) describes the fate of the soul after death. The Khūrda Avesta, or “Small Avesta,” is made up of minor texts.