Sasanian Empire
After hearing about the death of Peroz I, Shapur left Caucasus and returned to Ctesiphon, in order to protect the Sasanian Empire from the Hephthalites and to elect a new king. Balash, the brother of Peroz I, was crowned as the new king of the Sasanian Empire. However, it was in reality the father of Zarmihr Karen, Sukhra who exercised real power over the Sasanian Empire. After this event, Shapur is no longer mentioned in any sources.