Strengthened himself — He hardened his heart, as that word sometimes signifies. Princes — The chief of those Israelites, who out of love to God and the true religion, had forsaken their estates in the kingdom of Israel, and were now incorporated with the kingdom of Judah: because he thought these would be most zealous for that religion which he was resolved to oppose.
Related Commentaries of 2 Chronicles 21:4
2 Chronicles 21:4
4 Now when Jehoram was risen up to the kingdom of his father, he strengthened himself, and slew all his brethren with the sword, and divers also of the princes of Israel.