1 Maccabees 6:17

17 And when Lysias knew that the king was dead, he set up Antiochus his (i.e. the king’s) son to reignp, whom he had nourished up while yet young, and he called his name Eupator.

6:18–54. The struggle between Judas and the forces under Lysias and Eupator for the possession of Jerusalem and Bethsura.