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The Dahae (Persian: داها; Latin: Dahae; Greek: Δάοι (Daoi), Δάαι, Δᾶαι (Daai), Δάσαι (Dasai)), or Dahaeans were a confederacy of three Ancient Iranian tribes who lived in the region to the immediate east of the Caspian Sea. They spoke an Eastern Iranian language.
The first dateable mention of this nomad confederacy appears in the list of nations of Xerxes the great Daeva inscription. In this list of the peoples and provinces of the Achaemenid Empire, the Dahae are identified in Old Persian as Dāha and are immediately followed by a "Saka" group, who are listed as being neighbors of the Dāha. However, it is unclear whether the Dahae are also the *Dāha people (or *Dåŋha, only attested in the feminine Dahi) of the Avestan Yasht 13.144. An etymological relationship "is not proof that the two names refer to the same ethnic group."
In the 1st century BCE, Strabo (Geographika 11.8.1) refers to the Dahae explicitly as the "Scythian Dahae" ("Scythian" is in Strabo not necessarily an equation with the "Sacae"). The historiographer further places the Dahae in the approximate vicinity of present-day Turkmenistan.
The Dahae, together with the Saka tribes, are known to have fought in the Achaemenid armies at the Battle of Gaugamela. Following the fall of the Achaemenid Empire, they joined Alexander of Macedon in his quest to India. Saka coins from the Seleucid era are sometimes specifically attributed to the Dahae.
In the third century, a branch of Dahae called the Parni would rise to prominence under their chief Arsaces. They invaded Parthia, which had just previously declared independence from the Seleucids, deposed the reigning monarch, and Arsaces crowned himself king. His successors, who all named themselves Arsaces and are thus referred to as the Arsacids, would eventually assert military control over the entire Iranian plateau. By then, they would be indistinguishable from the Parthians, and would also be called by that name.
While 'Dahae' was preserved in the toponym 'Dahestan'/'Dihistan' - a district "on the eastern shore of the Caspian Sea" - "an urban center of the ancient Dahae (if indeed they possessed one) is quite unknown."
The Dahae should not by default be equated with Vedic Sanskrit's dasa. While the two are etymologically related, there is no directly transferable functional equivalence. In the Vedas, dasa is an ambiguous term that could mean any number of things, including - but not limited to - being a reference to a tribe. Even in this latter case, it only may refer to the same tribe as the Dahae; "man", which is probably the literal meaning of the root of the name, appears in the name of many tribes and individuals. If the Iranic and Indic terms were all - in addition to being etymologically related - also functionally equivalent, it would be enormously difficult to explain how the Avestan tribe that is exalted alongside the Aryans could simultaneously be vilified as the Daxiiu, the Anti-Aryans.
- Bivar, A.D.H. (1993), "The Political History of Iran under the Arsacids", in Fischer, W.B.; Gershevitch, Ilya, Cambridge History of Iran, 3.1, London: Cambridge UP, pp. 21–99
- de Blois, François (1993), "Dahae I: Etymology", Encyclopaedia Iranica, 6, Costa Mesa: Mazda, p. 581