Religion in the Sasanian Empire
Religion in the Sassanian era (Persian: دین در دوران ساسانی ) refers to events related to religion during the Sasanian Empire from 224 to 651 CE. == Manichaeism == It appears from various accounts that the second Sassanian king, Shapur I, was tolerant of foreign religions and ideas. Mani appeared during Shapur's time and reached Shapur's presence and was allowed to spread his religion.
Source: Wikipedia — Religion in the Sasanian Empire (CC BY-SA 4.0)