That leader was Cyrus the Persian. Daniel received two other visions regarding the Medo - Persian World Power.
(‏ دا ٧ :‏ ٥‏ )‏ وَفِي ٱلْأُخْرَى ،‏ تُشَبَّهُ بِكَبْشٍ ذِي قَرْنَيْنِ .‏ —‏ دا ٨ :‏ ​ ٣ ،‏ ٢٠‏ .‏