Validation of narrations aboutImam Sajjad's Mother being princess

In some narrations, it is narrated from the Imams (AS) that Shahrbanu, the mother of Imam ‎Sajjad (AS), was the daughter of Sassanid Yazdgerd. Such these narrations have led to the ‎belief that Imam Sajjad (AS) was a prince and of Iranian descent among the Imāmiyya. The ‎main question of the study is whether the existing historical reports confirm the ‎content of narrations related to the fact that Imam Sajjad (AS)chr('39')s mother was princess? In this ‎article, one narration from Saffar Qomi and two narrations from Sheykh Saduq about Imam ‎Sajjad (AS)chr('39')s mother being princess are analyzed in terms of documentation and content. Then, ‎by evaluating these three narrations with historical reports it was shown that these narrations are ‎not much valid. Likewise, this study indicated that the content of these narrations had not affected the spread of Shiism in Iran.‎