Hyrcania was the ancient name of Golestan, Mazandaran, Gilan and parts of Turkmenistan lands within Persian Empire by the Caspian Sea.
In the fifth century, the Greek researcher Herodotus of Halicarnassus mentions them several times in his Histories. He has a confused report on irrigation (3.117), which may be compared to the statement of the second-century historian Polybius that the Persians had built large irrigation works (World history 10.28.3). Herodotus also tells us that Hyrcanian soldiers were part of the large army which king Xerxes I (486-465) commanded against the Greeks in 480. The historian notes that they carried the same arms as the Persians. It is possible -but not proven- that during the Persian period, a wall was built to defend Hyrcania against the nomads of the Central-Asian steppe. The ruins of the wall north of the river Gorgân that are visible today and are called 'Gates of Alexander', were built later, but they probably replaced a Persian defense work. In the confused years after the death of king Artaxerxes I Makrocheir (465-434), three of his sons succeeded to the throne: Xerxes II, Sogdianus and Darius II. The latter was a satrap in Hyrcania and may have used troops from Hyrcania and the 'upper satrapies' - that is Aria, Parthia, Arachosia, Bactria and Sogdiana.
Hyrcania makes its reappearance in history when the Macedonian king Alexander the Great (336-323) invaded Asia. Hyrcanians are mentioned during the battle of Gaugamela (October 1, 331), and in August 329, when the last Persian king, Darius III Codomannus, was dead, many Persian noblemen fled to Hyrcania, where they surrendered to Alexander (a.o. Artabazus).
To the Parthians - the new name of the Parni tribe - Hyrcania was an important part of the empire, situated between their Parthian territories and their homeland on the steppe. It is certain that the Parthian kings used a Hyrcanian town as their summer residence. They were also responsible for the 'wall of Alexander', which is 180 km long and has forty castles. Nonetheless, it was not an uncontested part of their empire; for example, it is known to have revolted in AD 58.
It was conquered by Arabs in 8th century and by Mongols in 13th century.
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"Hyrcania".
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