
According to the semi-legendary Kar-Namag I Ardashir I Pabagan, a Middle Persian biography of Ardashir I, the daughter of the Parthian king Artabanus IV, Zijanak, attempted to poison her husband Ardashir. Discovering her intentions, Ardashir ordered her to be executed. Finding out about her pregnancy, the mobads (priests) were against it. Nevertheless, Ardashir still demanded her execution, which led the mobads to conceal her and her son Shapur for seven years, until the latter was identified by Ardashir, who chooses to adopt him based on his virtuous traits. This type of narrative is repeated in Iranian historiography. According to 5th-century BC Greek historian Herodotus, the Persian king Cambyses I wanted to have his son Cyrus killed because he believed that he would one day overthrow him. A similar narrative is also found in the story of the mythological Iranian king Kay Khosrow. According to the modern historian Bonner, the story of Shapur's birth and uprising "may conceal a marriage between Ardashir and an Arsacid princess or perhaps merely a noble lady connected with the Parthian aristocracy." On his inscriptions, Shapur identifies his mother as a certain Murrow