Answer: King Croesus of Lydia.
Some extra relevant information:
The only ruler in history who successfully defeated Cyrus the Great in Rise of Kingdoms is King Astyages. This legendary commander in the game was able to achieve this notable feat, which sets him apart from the others. Astyages’ exceptional leadership skills and strategic prowess allowed him to emerge victorious against one of history’s greatest conquerors. With his unique abilities and talents, King Astyages proves to be a formidable force on the battlefield in Rise of Kingdoms.