|Satrap of Parthia, Hyrcania, Media, Matiene and Sophene|
|Reign||521 - 480 BC|
Hydarnes (Greek: Ὑδάρνης, Old Persian: Vidarna), son of Bagābignahyā, was a Persian nobleman of the Achaemenid Empire in the 6th century BC.
In 522 BC, a Magian named Gaumâta seized power in the Achaemenid empire, claiming to be Smerdis, the brother of the legitimate king Cambyses. Hydarnes was one of the seven conspirators along with Otanes, Ardumanish, Gobryas, Intaphrenes, Megabyzos and Darius against the usurper Gaumâta. After they killed Gaumâta in September 522 BC, they proclaimed Darius the new Great King of Persia.
After the successful transfer of power, Hydarnes served Darius I as a commander against the rebellious Medes under Phraortes. In 521 BC, the Persians defeated the Medes in a battle near Maruš (Mehriz, thirty kilometres south of modern Yazd).
Hydarnes remained an influential man during the reign of Darius. From tablets found at Persepolis, it is known that he was satrap of Media in 499 BC. The influence of Hydarnes also secured the appointment of his sons as satraps. Herodotus states that Hydarnes’ son Sisamnes was the satrap of Aria and that the younger Hydarnes was "in command of the whole Asian seaboard". During the invasion of Greece in 480 BC, the younger Hydarnes was given command of the "Immortals"; while Sisamnes was given command of a levy of Aryans.
- Pierre Briant: From Cyrus to Alexander. A History of the Persian Empire. Translated by Peter T Daniels Eisenbrauns, 2002, ISBN 1-57506-031-0
- Herodotus, Herodotus, with an English translation by A. D. Godley. Cambridge. Harvard University Press. 1920.
- Herodotus: Histories III, 70
- Behistun Inscription, Column 2, §25.
- "Livius.org Articles on ancient history". Hydarnes (1). 1 January 2015. Retrieved 8 February 2015.
- Herodotus, Histories VI,133
- Herodotus: Histories. VII, 83
- Herodotus: Histories. VII, 66
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