Why did shi'i Islam become the mandatory faith of the Safavid dynasty

he Safavid conversion of Iran from Sunnism to Shiism took place roughly over the 16th ... More than most Muslim dynasties the Safavids worked for conversion to their ... Shiism did not become fully established until the reign of Abbas I of Persia ... It was only under Majlisi that Shi'a Islam truly took hold among the masses.

220 CE, Reestablished central rule over the tribes in Sassanian Dynasty (formerly ... Led Safavid Dynastyand declares Shi'i Islam as mandatory faith.