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The Persians (or Parsu, Parsua, Parsuash, Parsumash, from which the modern Fārs gained its name) were a later grouping of Indo-Europeans who migrated, probably along the River Oxus for part of its length, into Iran.
They settled to the east of ancient Elam during the period of instability and migration which occurred throughout the Middle East between 1200-900 BC.
They are attested there during the ninth and eighth centuries but disappear afterwards.
The southern groups, perhaps more numerous, trickle in through Drangiana and Carmania, towards southern Iran and begin to settle there.
That heritage would appear to make them descendants of Indo-Europeans who had bordered and integrated themselves into the Bronze Age culture known as the Bactria-Margiana Archaeological Complex, or Oxus Civilisation (centred on the later provinces of Bactria and Margiana).
Noted later by Herodotus (and therefore given with the Greek forms of their names alone), these ten clans existed around the mid-sixth century, when the Parsua were fighting to end Median vassalage.
The Assyrian king, Shalmaneser III, records their existence on the Black Obelisk, which covers his campaign of about this year.
Their position is not precisely fixed but 'Pasua' seems to lay in what is now Iranian Kurdistan (immediately east of Kurdistan in northern Iraq), far to the north of Persis and the heart of Persian settlement.
In fact, one of the names given by the Thiruvalangadu copperplate grant of the Chola family in India, Aryaman (shortly after around 1000 BC), is the source of the name 'Iran'.
This particular Aryaman was not the one who gave his name to that land, but either another (Persian) Indo-Iranian who also bore the name did just that, or the word originates in the name which the Indo-Iranians had for themselves - Aryans.