https://en.wikipedia.org/wiki/Arsaces_I_of_Parthia
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Parthia was under considerable Parni influence.[11] The Parni were not the only to migrate to Parthia, as the region was constantly receiving new waves of Iranian migrants from the north.[13]
The Parni were an eastern Iranian tribe, who practised Iranian polytheism.[14] By the middle of the 3rd-century BC, however, they had been assimilated into the local Parthian culture; they adopted Parthian, a north-western Iranian language, and became adherents of the Zoroastrianism religion, even giving themselves Zoroastrian names, such as Arsaces' father, Phriapites, whose name was derived from Avestan *Friya pitā ("father-lover").[4][14][15][a] Arsaces himself was probably born and raised in Parthia, speaking the Parthian language.[18] According to the French historian Jérôme Gaslain, Arsaces could have arguably spent much of his life in the Seleucid lands, and may even have belonged to the local elite of Parthia.[
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Arsaces was a Scythian or a Bactrian chieftain, who became the leader of the Parni, one of the three tribes of the Dahae confederacy of Central Asia.[8] The Dahae relied their strength completely on horseback, and thus possessed an extremely mobile force, which was able to retreat to the south of the Aral Sea when endangered.[9] Because of this, other empires met complications in their efforts trying to control them
https://www.metmuseum.org/toah/hd/part/hd_part.htm
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From the northeast of Iran, the Parni advanced toward the frontier of the Seleucid satrapy (administrative district) of Parthia, near the Caspian Sea. In about 250 B.C., they launched an invasion under their leader Arsaces. Known as the Parthians after their successful conquest of the land, they made their own imperial aspirations clear by instituting a dynastic era in 247 B.C., and subsequent rulers assumed the name Arsaces as a royal title.
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Most of the extant objects and monuments are from sites at the edges of the Parthian world, in Syria, Mesopotamia, and the Iranian plateau. The art of the Parthian capitals at Hecatompylos (Shahr-e Qumis in northeastern Iran), Ecbatana (Hamadan in west-central Iran) and Ctesiphon (in Iraq) is almost entirely lost. Overall, Parthian art resists a straightforward definition, as it employs styles and motifs from both Hellenistic and earlier Near Eastern traditions that result in innovations in various media
Balochi and Kurdish are under Parthian branch
[IMG]https://i.imgur.com/vDuXrQM.png[/IMG]