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King of Kings was a ruling title employed primarily by monarchs based in the Middle East. Though most commonly associated with Iran, especially the Achaemenid and Sasanian Empires, the title was originally introduced during the Middle Assyrian Empire by king Tukulti-Ninurta I and was subsequently used in a number of different kingdoms and empires, including the aforementioned Persia, various Hellenic kingdoms, Armenia, Georgia and Ethiopia. The title is commonly seen as equivalent to that of Emperor, both titles outranking that of king in prestige, stemming from the medieval Byzantine Emperors who saw the Shahanshahs of the Sasanian Empire as their equals. The last reigning monarchs to use the title of Shahanshah, those of the Pahlavi dynasty in Iran, also equated the title with "Emperor". The rulers of the Ethiopian Empire used the title of Nəgusä Nägäst, which was officially translated into "Emperor".