The Sassanian Dynasty ruled Persia from 224-651 AD. It was founded by Ardashir I who overthrew the Parthian Empire and established the Sassanian capital at Ardashir-Khwarrah. The Sassanians expanded the empire to the Indus River Valley and revived Persian culture, making Zoroastrianism the official religion. They had numerous kings over their nearly 500 year reign until being conquered by the Arab Muslims.