 He was also friendly towards Mani, the founder of Manichaeism, who was allowed to preach freely and even act as an escort in Shapur's military expeditions.Following Bahram I's accession to the throne, the rise of the authority of the Zoroastrian priesthood, and the increasing influence of Kartir, this changed.When Mani arrived at the city of Gundishapur there was uproar, in the same fashion as Jesus' entry into Jerusalem.