Shāh was the title of Iranian kings including the Achaemenid dynasty which unified Persia and created a vast intercontinental empire. The full title of the Achaemenid rulers was xšāyaθiya xšāyaθiyānām, "King of Kings", corresponding to Middle Persian šāhān šāh, literally "kings' king", and Modern Persian shāhanshāh (شاهنشاه). In Greek this phrase was translated as "βασιλεύς τῶν βασιλέων (basileus tōn basiléōn)", "king of kings", in rank rather equivalent to emperor.
OmegaWiki Dictionary
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Shah ruler of certain Southwest Asian and Central Asian countries, especially Persia
