 This has been taken as supporting Herodotus with regard to the succession of kings in which Cyrus the Great immediately followed Astyages as king of both Media and Persia, with no intervening Cyaxares II.Although the agreement between the Nabonidus Chronicle and Herodotus, that Cyrus conquered Astyages and put an end to the Median kingdom, has seemed conclusive to most modern scholars, there remain some difficulties.One of these is the consideration that Herodotus and the Nabonidus Chronicle may not be independent witnesses.