Daniel saw a two-horned ram trampled by a goat with one great horn; Gabriel explained that they were Medo-Persia and Greece.
The ram which you saw, that had the two horns, they are the kings of Media and Persia. The rough male goat is the king of Greece. The great horn that is between his eyes is the first king.
The kingdoms in Daniel's visions and how they have traditionally been understood.
The vision is unusually specific: the great horn is broken and replaced by four, matching Alexander the Great's empire divided among four generals. A later “little horn” who desecrates the sanctuary is commonly identified with Antiochus IV Epiphanes, who defiled the temple in 167 BC.