Theodoret of Cyrus
The prophet speaks of the goat among goats, representing the ruler of the Hellenes, while the prominent horn located between its eyes symbolizes the initial king, who is none other than Alexander.
And the he goat, is the king of the Greeks, and the great horn that was between his eyes, the same is the first king.
וְהַצָּפִ֥יר הַשָּׂעִ֖יר מֶ֣לֶךְ יָוָ֑ן וְהַקֶּ֤רֶן הַגְּדוֹלָה֙ אֲשֶׁ֣ר בֵּין־עֵינָ֔יו ה֖וּא הַמֶּ֥לֶךְ הָרִאשֽׁוֹן׃
One Church Father comments on this verse
The prophet speaks of the goat among goats, representing the ruler of the Hellenes, while the prominent horn located between its eyes symbolizes the initial king, who is none other than Alexander.
Passages read together with this verse.