 By Shapur's death the Sasanian Empire was stronger than ever before, considerably larger than when he came to the throne, the eastern and western enemies were pacified and Persia had gained control over Armenia.He is regarded as one of the most important Sassanian kings along with Shapur I and Khosrow I, and could after a long period of instability regain the old strength of the Empire.His three successors, however, were less successful than he.