|Satrap of Parthia, Hyrcania, Media, Matiene and Sophene|
|Reign||521 - 480 BC|
|Issue||Hydarnes II, Stateira, Terituchmes, Sisamnes|
Hydarnes (Greek: Ὑδάρνης, from Old Persian Vidarna- possibly New Persian H(a)idar), son of Bagābigna, was a Persian nobleman of the Achaemenid Empire in the late 6th and early 5th centuries BC. He was one of the seven conspirators against the usurper, Gaumâta, who killed him and then proclaimed Darius I as the Persian king. Hydarnes then served Darius I as a commander and remained influential during his reign.
The etymology of Vidarna is debatable. It is possible that it is from the root vida meaning knowledge with Vidarna signifying "the one who knows". Others believe the compound vi-drna suggests "strike" as in "one who strikes". The latter etymology raises an interesting prospect, for in Modern Persian and Urdu there is a possible surviving variant of the name in H(a)idar (حیدر) long thought to be of Arabic origin due to its literation but which means lion (the striking animal). If this is so, Vidarna could be rendered lion-like. Also, the lion has obvious association with mitra, a main god of the achaemenid religion.
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 Second Persian invasion of Greece in 480 BC, the younger Hydarnes was given command of the "Immortals"; while Sisamnes was given command of a levy of Arian troops.
- 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.
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