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Atar (fire), a primary symbol of Zoroastrianism
There are no written records from Zarathushtra's time. The earliest surviving written references to Zarathushtra are those of Greek writers. Zarathushtra and his first followers were Iranians that lived between the Bronze Age and Iron Age (est. 1200-600 BC).:1
The time of the Iranian peoples' migration to Iran can be mainly estimated through Assyrian records.:48 Also, Herodotus (I, 101) recalled one of the Mede tribes to be called "Magoi", better known as "Magis", a tribe known to have included many priests, who served both Medes and Persians. By the time of the Median empire (est. 612 BC), Zoroastrianism is known to have been well established in both the Pars region (later capital of Persia) as well as in the Eastern regions. :49
Persians led by Cyrus the Great soon established the second Iranian dynasty, and the first Persian empire by defeating the Medes dynasty in 549 BC.:49 As Persians expanded their empire, Zoroastrianism was introduced to Greek historians such as Hermodorus, Hermippus, Xanthos, Eudoxus and Aristotle; each giving a different date regarding the life of Zoroaster but naturally believed him to be a Persian prophet and called him "Master of the magi"
Although there are no inscriptions left from the time of Cyrus about his religion, the fire-altars found at Pasargadae, as well as the fact that he called his daughter Atossa, name of the queen of Vishtaspa (Zoroaster's royal patron), suggests that he indeed may have been a Zoroastrian.
However, it is clear that by the time of Darius the Great (549 BC– 485/486 BC), the empire was clearly in favour of Zoroastrianism. Darius declares in one of his inscriptions that:
Persepolis (or Parsa) was one of the four capitals of the Achaemenid empire, built by Darius the Great and his son Xerxes; it was a glorious city known to the world as the "richest city under the sun". It was also the trading capital of the Near East.
One of the main functions of Persepolis was to serve as the host of the ancient Zoroastrian festival, Norouz. Therefore, every year representatives from each country under the rule of Persia would bring gifts to Persepolis to show their loyalty to the king and the empire.
The Sassanid dynasty (224-651 AD) was the first Persian empire which declared Zoroastrianism as the state religion and promoted the religion more than ever. It is believed that the Avesta (a compilation of Zoroastrian sacred texts) was first gathered and put together at this time.
During the period of their centuries long suzerainty over the Caucasus, the Sassanids made attempts to promote Zoroastrianism there with considerable successes, and it was prominent in the pre-Christian Caucasus (especially modern-day Azerbaijan).
Due to its ties to the Christian Roman Empire, Persia's arch-rival since Parthian times, the Sassanids were suspicious of Roman Christianity, and after the reign Constantine the Great sometimes persecuted it. The Sassanid authority clashed with their Armenian subjects in the Battle of Avarayr (451 CE), making them officially break with the Roman Church. But the Sassanids tolerated or even sometimes favored the Christianity of the Nestorian Church of Persia. The acceptance of Christianity in Georgia (Caucasian Iberia) saw the Zoroastrian religion there slowly but surely decline, but as late the 5th century AD it was still widely practised as something like a second established religion.
The prophet Mani was an Iranian of noble Parthian roots who established Manichaeism which contained many elements of Zoroastrianism as well as Gnosticism, however it saw the experience of life on earth by humans as miserable, which was a contrast to the Zoroastrian view which was to celebrate life through happiness.
Mani was received kindly by king Shapur I and spent many years at his court where he was protected during all of Shabuhr's reign. However Mani wrote in a semitic language (Syriac Aramaic), and all his work had to be translated into Middle Persian by his followers, who rendered the name of Mani's supreme god as Zurvan and called him the father of Ohrmazd (Ahuramazda, God of Wisdom, main deity of Zoroastrianism).
Although the origins of Zurvanite Zoroastrianism are unclear, it was during the Sassanid period that it gained widespread acceptance, and many of the Sassanid emperors were at least to some extent Zurvanites. Zurvanism enjoyed royal sanction during the Sassanid era but no traces of it remain beyond the 10th century.
Unlike Mazdean Zoroastrianism, Zurvanism considered Ahura Mazda not the transcendental Creator, but one of two equal-but-opposite divinities under the supremacy of Zurvan. The central Zurvanite belief made Ahura Mazda (Middle Persian: Ohrmuzd) and Angra Mainyu (Ahriman) twin brothers that had co-existed for all time.
Non-Zoroastrian accounts of typically Zurvanite beliefs were the first traces of Zoroastrianism to reach the west, which misled European scholars to conclude that Zoroastrianism was a dualist faith.
The Zoroastrian cult of Zurvan should not be confused with the Manichaeism's use of the name Zurvan in Middle Persian texts to represent the Manichean deity of light. Mani had himself introduced this practice (for perhaps political reasons) in his Shapurgan, which he dedicated to his patron Shapur II. For much of the rest of the Sassanid era, the Manichaens were a persecuted minority, and Mani was sentenced to death by Bahram I.
The three great sacred fires of Persia at the time of the Sassanids were the Adur Farnbag, Adur Gushnasp and the Adur Burzen-Mihr which burnt in Pars, Media and Parthia respectively. Of these three the Adur Burzen-Mihr was the most sacred fire as it was linked to the prophet Zarathustra himself and king Vishtaspa.
The Muslim conquest of Persia, also known as the Arab conquest of Iran led to the end of the Sasanian Empire in 651 and the eventual decline of the Zoroastrian religion in Iran. Arabs first attacked the Sassanid territory in 633, when general Khalid ibn Walid invaded Mesopotamia (what is now Iraq), which was the political and economic center of the Sassanid state. Following the transfer of Khalid to the Roman front in the Levant, the Muslims eventually lost their holdings to Iranian counterattacks. The second invasion began in 636 under Saad ibn Abi Waqqas, when a key victory at the Battle of Qadisiyyah led to the permanent end of Sasanian control west of Iran. The Zagros mountains then became a natural barrier and border between the Rashidun Caliphate and the Sassanid Empire. Owing to continuous raids by Persians into the area, Caliph Umar ordered a full invasion of the Sasanian Iranian empire in 642, which was completed with the complete conquest of the Sasanians around 651 The quick conquest of Iran in a series of well coordinated multi-pronged attacks, directed by Caliph Umar from Medina several thousand kilometres from the battlefields in Iran, became his greatest triumph, contributing to his reputation as a great military and political strategist.
Iranian historians have sought to defend their forebears by using Arab sources to illustrate that "contrary to the claims of some historians, Iranians, in fact, fought long and hard against the invading Arabs." By 651, most of the urban centers in Iranian lands, with the notable exception of the Caspian provinces and Transoxiana, had come under the domination of the Arab armies. Many localities in Iran staged a defense against the invaders, but in the end none was able to repulse the invasion. Even after the Arabs had subdued the country, many cities rose in rebellion, killing the Arab governor or attacking their garrisons, but reinforcements from the caliphs succeeded in putting down all these rebellions and imposing the rule of Islam. The violent subjugation of Bukhara after many uprisings is a case in point. Conversion to Islam was, however, only gradual. In the process, many acts of violence took place, Zoroastrian scriptures were burnt and many mobads executed. Once conquered politically, the Persians began to reassert themselves by maintaining Persian language and culture. Regardless, Islam was adopted by many, for political, socio-cultural or spiritual reasons, or simply by persuasion, and became the dominant religion.
The Mongol invasion of Iran resulted in millions of deaths and ruined many cities. The early Mongol invaders were, however, pagans or Buddhists so most of their attention was directed towards Muslims, whom they hated. However, within half a century of the conquest, the leader of the Il-Khanate, Ghazan Khan, became a Muslim, which did not help the status of Zoroastrians in Iran. However, by the time that the Mongols were expelled, Pars province had escaped major damage and the Zoroastrians moved to the North of Pars mainly in the regions of Yazd and Kerman, where even today the main Zoroastrian communities are found.
Starting from the early twentieth century, Tehran, the nation's capital, experienced rapid migrations from all Iranian minorities. The Zoroastrian population increased from about 50 merchants in 1881 to 500 by 1912.
During the reign of the Pahlavi dynasty, Zoroastrians changed from being one of the most persecuted minorities in Iran to a symbol of Iranian nationalism. This notion carried on all the way through the 1979 Islamic Revolution when Ayatollah Sadughi proclaimed that "We Muslims are like the branches of a tree, if our roots are cut off, we shall shrivel up and die", also the last prime minister before the revolution Shapour Bakhtiar held an anti-Ayatollah Khomeini meeting in Los Angeles, California on the day of the Zoroastrian Mehregan festival (1980), in tribute to "true nationalism" (see Iranian nationalism).
Like the Armenian, Assyrian and Persian Jewish communities, Zoroastrians are officially recognized and on the grounds of the 1906 Constitution allocated one seat in the Iranian Parliament, currently held by Esfandiar Ekhtiari Kassnavieh. Out-marriage and low birth rates affect the growth of Iran's Zoroastrian population which, according to Iran's 2012 census results stood at 25,271, though this represented an increase of 27.5% on the 2006 population
In 2013, Sepanta Niknam was elected to the city council of Yazd and became the first Zoroastrian councillor in Iran. but he was removed by Guardian council of Islamic Republic of Iran on the ground of non-muslims should not be a member of city council in Iran. This brought a lot of criticism from Iranian parliament and Iranian public. Important Zoroastrians in the 20th century: