The Kings of Persis, also known as the Darayanids, were a series of Persian kings, who ruled the region of Persis in southwestern Iran, from the 2nd century BCE to 224 CE. They ruled as sub-kings of the Parthian Empire, until they toppled them and established the Sasanian Empire. They effectively formed some Persian dynastic continuity between the Achaemenid Empire (6th century BCE – 4th century BCE) and the Sasanian Empire (3rd century CE – 7th century CE).