
The Parni (aɪ; Πάρνοι, Parnoi) or Aparni (aɪ; Ἄπαρνοι, Aparnoi) were an east Iranian people of the Ochus (Ὧχος Okhos) (Tejen) River valley, southeast of the Caspian Sea. The Parni were one of the three tribes of the Dahae confederacy. In the middle of the 3rd century BCE, the Parni invaded Parthia, `drove away the Greek satra....
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http://en.wikipedia.org/wiki/Parni

one of three nomadic or seminomadic tribes in the confederacy of the Dahae living east of the Caspian Sea; its members founded the Parthian empire. ... [3 related articles]
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http://www.britannica.com/eb/a-z/p/21
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