Shah: A hereditary monarch of Persia or Iran.
The word "shah" was first used during the Achaemenid Empire (550-330 B.C.), and continued to be used until the fall of Mohammad Reza Shah Pahlavi in 1979.
A number of other languages have adopted the word "shah," and it is used as a last name in India.
"Shah" comes from the Old Persian word khshayathiya, meaning "king."
"The word shahbanu, meaning 'lady,' has been used as the title for the wives of the shahs."