He is notable for having a rock relief carved at Taq-e Bostan, depicting a scene of him along with his father. He was the penultimate monarch to have a rock relief carved, the last one being Khosrow II (), who mimicked and magnified Shapur III's work. The king died in 388, after reigning for five years. He was crushed by the collapsing weight of his own tent, after some conspiring nobles had cut its ropes. His son Bahram IV succeeded him.