LYCOS RETRIEVER 
Persian: Persian Empire
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It may have been during the Achaemenid period that Zoroastrianism reached South-Western Iran, where it came to be accepted by the rulers and through them became a defining element of Persian culture. The religion was not only accompanied by a formalization of the concepts and divinities of the traditional (Indo-)Iranian pantheon, but ... introduced several novel ideas, including that of free will, which is arguably Zoroaster's greatest contribution to religious philosophy. Under the patronage of the Achaemenid kings, and later as the de-facto religion of the state, Zoroastrianism would reach all corners of the empire. In turn, Zoroastrianism would be subject to the first syncretic influences, in particular from the Semitic lands to the west, from which the divinities of the religion would gain astral and planetary aspects and from where the temple cult originates. It was also during the Achaemenid era that the sacerdotal Magi would exert their influence on the religion, introducing many of the practices that are today identified as typically Zoroastrian, but also introducing doctrinal modifications that are today considered to be revocations of the original teachings of the prophet.
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The Parthians brought the Persian Gulf under Persian control and extended their influence as far as Oman. The Parthian conquests demarcated the distinction between the Greek world of the Mediterranean Sea and the Persian Empire in the East. The Greeks, and the Romans after them, depended on the Red Sea route, whereas the Parthians depended on the Persian Gulf route. Because they needed to keep the merchants who plied those routes under their control, the Parthians established garrisons as far south as Oman. In the third century AD, the Sassanians, another Persian dynasty, succeeded the Parthians and held the area until the rise of Islam four centuries later.
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The Cyrus Cylinder is an artifact of the Persian Empire, consisting of a declaration inscribed on a clay barrel. Upon his taking of Babylon, Cyrus the Great issued the declaration, containing an account of his victories and merciful acts, as well as a documentation of his royal lineage. It was discovered in 1879 in Babylon, and today is kept in the British Museum.
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