His name appears twice in Arrian's Anabasis and once in Historiae Alexendri Magni by Curtius.
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Saśigupta (Arrian Sisikottos; Curtius Sisocostus) was an historical personage of considerable eminence hailing from the Paropamisadaen region i.e. region lying between Hindukush and Indus.
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A few months later when Alexander was still in Punjab and was engaged in war with the Glausais of Ravi/Chenab, the Asvakas had assassinated Nicanor, the Greek governor of lower Kabul valley and also issued a threat to kill Saśigupta if he continued to cooperate with the invaders.