Cyrus II, or Cyrus the Great, founded the first Persian empire, the Achaemenid Empire. His kingdom extended from Western Asia to Central Asia. He advocated centralized administration, with the help of local governors. The biblical Edict of Cyrus, named after him, talks about the return of the Jews to Israel.
Mohammad Reza Pahlavi served as the last king of Iran from 1941 to 1979. During his reign, Iran witnessed rapid military and industrial modernization and several social and economic reforms. During his rule, Iran also enjoyed a spike in economic growth, surpassing France, England, and the US. However, the Iranian Revolution, which was unusual in many ways, overthrew the king.
3 Xerxes I
Xerxes I ruled the Achaemenid Empire from 486 to 465 BC as the fourth King of Kings. During his reign, Xerxes I supervised the completion of several construction projects at Persepolis and Susa. A popular ruler, his life has been adapted into several plays and films; in the 1960 movie Esther and the King, Xerxes is played by Richard Egan.
Nader Shah reigned over Iran as the Shah of Iran from 1736 until his death in 1747. He is widely regarded as one of the most powerful rulers in the history of Iran. He has also been described as the Napoleon of Persia, thanks to his military genius, which was evident in his several campaigns.