See 2 Kings 8:18. The writer of Kings only tells us in general terms that Jehoram “did evil in the sight of the Lord,” and “walked in the way of the house of Ahab.” Here, in 2 Chronicles 21:11, 2 Chronicles 21:13, we have particulars of his idolatry. Jehoram, it seems, seduced by the evil influence of his wife - Athaliah, the daughter of Ahab - permitted the introduction of Baal-worship, idolatrous altars in various high places, groves (Asherahs), images, and pillars; the people were not only allowed, but compelled to take part in the new rites. “To commit fornication” is a common metaphor, signifying idolatry or spiritual unfaithfulness (compare the 2 Kings 9:22 note).
Related Commentaries of 2 Chronicles 21:11
2 Chronicles 21:11
11 Moreover he made high places in the mountains of Judah, and caused the inhabitants of Jerusalem to commit fornication, and compelled Judah thereto.