The ram which you saw having two horns are the kings of Media and Persia. And the rough goat is the king of Greece: and the great horn that is between his eyes is the first king [Alexander the Great]. Now that being broken, whereas four stood up for it, four kingdoms shall stand up out of the nation, but not in his power (Daniel 8:20-22).
And when the Book of Daniel was showed him [Alexander the Great] wherein Daniel declared that one of the Greeks should destroy the empire of the Persians, he supposed that himself was the person intended.
----Flavius Josephus, The Antiquities of the Jews, 94 AD
United Greek Kings: Alexander III the Great, Philip III, Alexander IV
And when he shall stand up, his kingdom shall be broken, and shall be divided toward the four winds of heaven; and not to his posterity, nor according to his dominion which he ruled: for his kingdom shall be plucked up, even for others beside those (Daniel 11:4).
After Alexander's death, four generals divide the Greek Empire through the Wars of Diadochi or succession. Four civil war lasted forty years and set up a series of wars between Greek Syria (north) and Greek Egypt (south) fighting for control over Israel.
Greece Divided
Greece - Lysimachus
Asia Minor - Cassander
Syria/Babylon/Persia - Seleucus (North)
Egypt - Ptolemy (South)