Shananshah (Persian: شاهنشاه) (sometimes written Shahenshah, Shan-an-shah, or Shan-en-shah) was a title used by various kings of the Persian Empire/Iran. It literally means "Shah of Shahs", or "King of Kings" and is synonymous with Emperor. The frist Persian Shahanshah was Cyrus the Great, the last one Mohammad Reza Shah.