The Seleucids came about after Alexander the Great died. Alexander had tolerated the Jewish people in the land of Canaan. After he died his generals broke up is empire. 150 years after Alexander's death the Seleucid ruler wished to conquer Egypt. He had to starts with the Jews in Israel. They tried to make them accept Greek culture but they revolted when the Greeks tried to force them to sacrifice and eat pigs. That's not kosher!
The Maccabees, 166 B.C., The Agrarian Wars by Meyer Levin