Sisikottos/Sisocostus appears twice in Arrian's Anabasis and once in Historiae Alexendri Magni by Curtius. Many scholars suggest that Shashigupta was a ruler of some frontier hill state south of Hindukush, it is however, more appropriate to call him a military adventurer or a corporation leader coming from the warlike background of the fierce Kshatriya clan of the Ashvakas from Massaga or Aornos (Pir-Sir) or some other adjacent territory of the Ashvakas. No ancient evidence is available which attests Shashigupta's royal background prior to his appointment by Alexander as ruler of the Ashvakas of the Aornos country.