Astyages (spelled by Herodotus as Ἀστυάγης - Astyages; by Ctesias as Astyigas; by Diodorus as Aspadas; Akkadian: Ištumegu, was the last king of the Median Empire, r. 585 BCE-550 BCE, the son of Cyaxares; he was dethroned in 550 BCE by Cyrus the Great. His name derives from the Old Iranian Rishti Vaiga, which means "swinging the spear, lance-hurler."Astyages, Encyclopaedia Iranica
Read more about Astyages: Reign, Cyrus and Astyages in Herodotus, Defeat