Then I lifted up my eyes, and saw, and, behold, there stood before the river a ram which had two horns: and the two horns were high; but one was higher than the other, and the higher came up last.
All Commentaries on Daniel 8:3 Go To Daniel 8
Jerome
AD 420
He calls Darius, Cyrus's uncle, a ram. He reigned over the Medes after his father, Astyages. And the one horn which was higher than the other, and growing still larger, signified Cyrus himself, who succeeded his maternal grandfather, Astyages, and reigned over the Medes and Persians along with his uncle, Darius, whom the Greeks called Cyaxeres.