Gushnaspdād, known in Byzantine sources as Gousanastadēs (Γουσαναστάδης), was a Sasanian nobleman, who was kanarang during the reign of Balash (r. 484–488), and Kavad I (r. 488–531).
After Balash's accession, Gushnaspdad urged the Sasanian noblemen to execute Kavad I, the brother of Jamasp.
He is reportedly said to have told the Sasanian noblemen while holding a knife: "You see this knife, how extremely small it is; nevertheless it is able at present time to accomplish a deed which, be assured, my dear Persians, a little later two myriads of mail clad men could not bring to pass."
However, the Sasanian nobles declined the decision, and instead had Kavad imprisoned; however, he later managed to escape and took refugee in Central Asia.
[2][3] Kavad then captured Ctesiphon, restored his rule, and had Gushnaspdad executed.