The Asii, Osii, Ossii, Asoi, Asioi, Asini or Aseni were an ancient Indo-European people of Central Asia, during the 2nd and 1st Centuries BCE. Known only from Classical Greek and Roman sources, they were one of the peoples held to be responsible for the downfall of the Greco-Bactrian Kingdom.
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Modern scholars have attempted to identify the Asii with other peoples known from European and Chinese sources including the: Yuezhi, Tocharians, Issedones/Wusun and/or Alans.
Possible links to other peoples
Many theories have been proposed by historians and other scholars as to their origins, relationships, language, culture, etc., but so far no consensus has emerged.
It is generally accepted that the Asiani mentioned by Trogus were probably identical to the Asii of Strabo.
There is no agreement over whether another tribe mentioned by Strabo, the "Pasiani" were likewise related. Scholars such as J. Marquart believe that they were synonymous with the Asiani. W. W. Tarn, Moti Chandra and some other scholars think that "as Asiani is the (Iranian) adjectival form of Asii, so Pasiani would be the similar adjectival form of, and would imply, a name *Pasii or *Pasi". In other words, the Asii and the Pasiani were one and the same, and "Pasiani" was a misspelling of Asiani, or a variant of the same name. Others suggest that the name is a misspelling of Gasiani, a name which is believed by Chinese scholars to be connected to the Kushan Empire (endonym: Kushano; Chinese: Guishuang 貴霜).
Yuezhi & Tocharians
Other scholars have proposed, more controversially, that the Asii, Yuezhi and/or Tocharians were closely related.
Alfred von Gutschmid believed that Asii, Pasiani and other names mentioned by Strabo are an attempt to render Yuezhi in Greek. W. W. Tarn first thought that the Asii were probably one part of the Yuezhi, the other being the Tocharians. However, he later expressed doubts as to this position.
The Asii were identical with the Paisani (Gaisani) and were, therefore, also the Yuezhi.
The Asii were probably one of three Scythian tribes, whereas the Tochari were probably not, and should be identified with the Yuezhi.
One of the most important sources of information on nomad migration in Central Asia is Justin's Prologue to Pompeius Trogus (prologue to book XLII), which states that 'the Asiani are kings of the Tochari and destroyed the Sacaraucae' (Reges Tocharorum Asiani interiusque Sakaraucarum). It is possible to conclude from this extract that the Asiani and the Tochari were closely related tribes. What is more, it indicates that the 'Asiani' dominated the 'Tochari' (Reges Tocharorum Asiani). We can identify the Asiani with the Kushans (von Gutschmidt 1888; Haloun 1937; Bachhofer 1941; Daffina 1967), one of the leading tribes, which subsequently came to power and created a great empire. It is noteworthy that Justin says that the Tochari were ruled by the Asiani, while the Chinese sources identify them as the largest of the five Yuezhi principalities.
By the middle of the 1st Millennium CE, speakers of the so-called Tocharian A language in the Tarim Basin, apparently referred to themselves as Ārśi (pronounced "arshi"; apparently meaning "shining" or "brilliant").
Issedones/Wusun
Asii or Asiani may simply be a corruption of the name of the Issedones – an Iranian people mentioned by Herodotus – who are frequently identified with the Wusun mentioned in contemporaneous Chinese sources.
Taishan Yu proposes that Asii were "probably" the dominant tribe of a confederacy of four Issedonean tribes "from the time that they had settled in the valleys of the Ili and Chu" who later invaded Sogdiana and Bactria. "This would account for their being called collectively "Issedones" by Herodotus." He also states that the "Issedon Scythia and the Issedon Serica took their names from the Issedones." Yu believes that the Issedones must have migrated to the Ili and Chu valleys, "at the latest towards the end of the 7th century B.C."
It has been suggested that the Wusun may also be identified in Western sources as their name, pronounced then *o-sən or *uo-suən, is not far removed from that of a people known as the Asiani who the writer Pompeius Trogus (1st century BC) informs us were a Scythian tribe.
Alans
The Asii/Asiani have also been identified with the Alans – i.e. a western Central Asian population, rather than the Yuezhi-Tochari of eastern Bactria – from whom the modern Ossetians derive their name.
With this identification of the Asii-Asiani, the Prologues seem instead to concern two later distinct periods already disconnected from the time of Eucratides. Moreover, from a geographical point of view, they describe events not related to the eastern, but to the western border of the Graeco-Bactrian kingdom, that is a region which was in close contact with Parthia. Therefore, the ethnonym of the Asii-Asiani should be transferred westwards, that is to a different historical context (the Kangju area).