Azhdahak (also spelled Ashdahak) is the Armenian form of the name of the Avestan demon Azhi Dahaka. In Iranian mythology, he is imprisoned in Mount Damavand, but will at the end of time break out, to be ultimately defeated by Fereydun. In his History of Armenia, the Armenian writer Movses Khorenatsi identified Azhdahak with the Median king Astyages . Astyages' name (which is the Greek transliteration of the Old Iranian *Aršti-vaiga) was similar to that of Azhdahak, and the name Māda ('Mede') was pronounced in Armenian as, which means snake in Iranian languages. The Armenian form Azhdahak was borrowed from Parthian (compare Manichaean Parthian {{script|Mani| ʾjdhʾg).