Daniel 8:19-21

And he said to me, "I will reveal to you what the future things are in the earlier tribulation, for the time has its end. The ram, which you saw to have horns, is the king of the Medes and Persians. Furthermore, the he-goat among she-goats is the king of the Greeks, and the great horn, which was between his eyes, is the same one, the first king.