How many kings ruled Persia?

The number of kings who ruled Persia varies depending on the historical period considered. The Achaemenid Empire, one of the most notable Persian dynasties, had around 14 kings, including famous rulers like Cyrus the Great and Darius I. Other dynasties, such as the Parthians and Sassanids, also had their own series of kings. Overall, if considering all dynasties from ancient to modern times, the total number of Persian rulers would be in the dozens.