The city of Nineveh was captured by his successor Cyaxares, who extended this kingdom's borders to the Halys river in Asia Minor.  
The earliest references in Babylonian and Assyrian texts to this kingdom call it Anshan.  According to Herodotus, its most famous capital was supposedly established by Deiokes, who was succeeded by Phraortes.  The city of Nineveh was captured by his successor Cyaxares, who extended this kingdom's borders to the Halys river in Asia Minor.  This kingdom fought a famous war with Nabonidus of Babylon, but it is perhaps most famous for seeding the Persian Empire.  With capital at Ecbatana, FTP, identify this ancient kingdom whose leader Astyages was overthrown by Cyrus the Great.
The earliest references in Babylonian and Assyrian texts to this kingdom call it Anshan.  
Medes or Media